LSAT Logical Reasoning: Weaken the Argument Questions — Questions and Answers

Question 1: A city council member argues that building a new highway through the suburbs will reduce downtown traffic congestion because commuters will have a faster route into the city. Which of the following, if true, most weakens this argument?

The highway construction will take three years to complete.
Studies show that new roads attract additional drivers, increasing total traffic volume. (Correct answer)
Some commuters prefer public transportation over driving.
The highway will pass through areas with low population density.
Downtown parking fees have increased significantly in recent years.

Correct answer: Studies show that new roads attract additional drivers, increasing total traffic volume.

The argument assumes the highway will reduce congestion, but if new roads attract additional drivers (induced demand), total traffic volume could increase rather than decrease.

The council member's argument assumes a fixed number of drivers who will simply redistribute. Answer B introduces the concept of induced demand—when road capacity increases, more people choose to drive, potentially negating any congestion relief. This directly undermines the causal claim that the highway will reduce congestion.

Question 2: A nutritionist claims that people who eat breakfast daily perform better at work than those who skip breakfast, citing a study of office workers. Which of the following most weakens this argument?

The study was conducted over only two weeks.
People who eat breakfast may also engage in other healthy habits that improve performance. (Correct answer)
The office workers in the study were all in sedentary jobs.
Breakfast foods vary widely in nutritional content.
The study did not measure caloric intake throughout the day.

Correct answer: People who eat breakfast may also engage in other healthy habits that improve performance.

This introduces a confounding variable: breakfast eaters may have other healthy habits (better sleep, exercise) that actually cause better performance, making breakfast merely correlative, not causal.

The nutritionist commits the correlation-causation fallacy. Answer B identifies that breakfast eating may correlate with other health-conscious behaviors. These confounding factors—not breakfast itself—could be responsible for better work performance, severing the causal link the nutritionist claims.

Question 3: An economist argues that raising the minimum wage will increase unemployment because businesses will hire fewer workers when labor costs rise. Which of the following, if true, most weakens this conclusion?

Many minimum wage workers are teenagers living with their parents.
Higher wages increase consumer spending, which can create additional jobs. (Correct answer)
Some businesses operate in industries with thin profit margins.
The minimum wage has not been raised in over a decade.
Automation technology is becoming increasingly affordable.

Correct answer: Higher wages increase consumer spending, which can create additional jobs.

If higher wages increase consumer spending sufficiently to create new jobs, the net employment effect could be neutral or positive, directly undermining the unemployment prediction.

The economist's argument is a standard supply-side labor model. Answer B introduces a demand-side counter: increased wages → increased consumer spending → increased business revenue → increased hiring. This multiplier effect could offset or exceed the initial reduction in hiring, weakening the unemployment conclusion.

Question 4: A school principal argues that eliminating recess will improve student academic performance because students will have more time for instruction. Which of the following most weakens this argument?

Students in other countries also have recess periods.
Research shows that physical activity improves concentration and cognitive function. (Correct answer)
Some students use recess time to socialize rather than exercise.
Teachers need break periods as well as students.
The school day is already longer than the national average.

Correct answer: Research shows that physical activity improves concentration and cognitive function.

If physical activity during recess improves students' ability to concentrate and learn, removing recess could decrease learning efficiency enough to offset any gains from additional instruction time.

The principal assumes that time spent in class directly correlates with learning. Answer B challenges this by showing that physical activity enhances cognitive function—so students who lack recess may be less able to absorb instruction, making the additional class time less effective and potentially reducing overall academic performance.

Question 5: A pharmaceutical company argues that its new drug is safe because none of the 200 participants in its clinical trial experienced serious side effects. Which of the following most weakens this argument?

The drug is intended to treat a rare disease.
Some serious side effects may only manifest after long-term use exceeding the trial duration. (Correct answer)
Two participants experienced mild headaches during the trial.
The drug received approval in another country last year.
The trial was conducted at a single research hospital.

Correct answer: Some serious side effects may only manifest after long-term use exceeding the trial duration.

If serious side effects only emerge after long-term use, a short-term trial cannot establish long-term safety, directly undermining the safety claim.

The company's safety claim is based on a finite trial period. Answer B points out a critical gap: delayed adverse effects would not appear in a short trial. The absence of side effects during the trial therefore does not confirm long-term safety, substantially weakening the conclusion.

Question 6: A city planner argues that installing more streetlights in high-crime neighborhoods will reduce crime because criminals prefer to operate in darkness. Which of the following most weakens this argument?

Streetlights are expensive to install and maintain.
Criminals may simply move their activities to adjacent unlit areas rather than stopping. (Correct answer)
Some crimes, such as fraud, occur indoors and are unaffected by lighting.
Residents in the neighborhoods support the streetlight initiative.
The city has successfully used streetlights to reduce crime in one previous instance.

Correct answer: Criminals may simply move their activities to adjacent unlit areas rather than stopping.

If criminals merely relocate to darker areas rather than ceasing criminal activity, the overall crime rate is unchanged—the plan reduces local crime but doesn't reduce total crime.

The planner assumes that lighting deters crime absolutely. Answer B introduces crime displacement: criminals adapt by moving rather than stopping. This means the streetlights would shift crime geographically without reducing it, undermining the claim that the plan will reduce crime in any meaningful sense.

Question 7: A manager argues that open-plan offices increase productivity because employees can communicate more easily with each other. Which of the following most weakens this argument?

Open-plan offices are less expensive to build than offices with private rooms.
Studies show that noise and interruptions in open offices reduce individuals' ability to focus on complex tasks. (Correct answer)
Some employees prefer working from home.
The company recently hired 20 new employees who need workspace.
Communication technology allows employees to collaborate without being in the same room.

Correct answer: Studies show that noise and interruptions in open offices reduce individuals' ability to focus on complex tasks.

If noise and interruptions reduce focus on complex tasks, the communication benefits of open plans may be outweighed by decreased individual productivity, undermining the overall productivity claim.

The manager conflates communication ease with productivity. Answer B reveals a trade-off: while open offices may increase casual communication, they create distractions that harm deep work. For knowledge workers requiring concentration, this negative effect could more than offset the communication benefits, weakening the conclusion.

Question 8: An environmentalist argues that banning plastic bags will significantly reduce ocean pollution because plastic bags are a major component of ocean debris. Which of the following most weakens this argument?

Some plastic bags are made from recycled materials.
Plastic bags account for less than 1% of ocean plastic by weight, with most coming from fishing nets and industrial waste. (Correct answer)
Many consumers have already switched to reusable bags voluntarily.
The ban would apply only to retail stores, not restaurants.
Paper bags also have environmental costs during production.

Correct answer: Plastic bags account for less than 1% of ocean plastic by weight, with most coming from fishing nets and industrial waste.

If plastic bags constitute less than 1% of ocean plastic, banning them would have minimal impact on ocean pollution, directly challenging the claim that such a ban would 'significantly reduce' it.

The environmentalist's argument depends on plastic bags being a 'major component' of ocean debris. Answer B directly attacks this premise with a factual counterpoint: if bags are a tiny fraction of the problem, the causal mechanism breaks down and the ban would achieve negligible reduction in ocean pollution.

Question 9: A doctor argues that patients who follow Mediterranean diets have lower rates of heart disease, therefore the diet causes reduced heart disease risk. Which of the following most weakens this argument?

The Mediterranean diet emphasizes olive oil, fish, and vegetables.
People who follow Mediterranean diets tend to live in regions with warmer climates and more active lifestyles. (Correct answer)
Heart disease is the leading cause of death in many Western countries.
The diet is difficult and expensive to maintain.
Several cardiologists have endorsed the Mediterranean diet.

Correct answer: People who follow Mediterranean diets tend to live in regions with warmer climates and more active lifestyles.

Confounding lifestyle factors (active outdoor living, warmer climate reducing stress) may explain lower heart disease rates, meaning the diet itself may not be the causal factor.

The doctor draws a causal conclusion from correlational data. Answer B identifies geographic and lifestyle confounders: Mediterranean populations may have lower heart disease due to physical activity and climate-related stress reduction, not the diet specifically. This alternative explanation weakens the causal claim.

Question 10: A tech executive argues that social media increases political polarization because users are exposed primarily to content that confirms their existing views. Which of the following most weakens this argument?

Social media platforms use algorithmic feeds that prioritize engagement.
Research shows that political polarization has been rising since decades before social media existed. (Correct answer)
Many users follow accounts with opposing political viewpoints.
Social media companies have tried to reduce the spread of misinformation.
Younger generations use social media more than older generations.

Correct answer: Research shows that political polarization has been rising since decades before social media existed.

If polarization was already increasing before social media existed, social media may not be the cause—correlation does not establish causation, especially when the trend predates the proposed cause.

The executive attributes polarization to social media's echo chamber effect. Answer B undermines this by showing that polarization was increasing well before social media's rise. If the dependent variable was already moving in the claimed direction without the alleged cause, social media cannot be identified as the primary driver.

Question 11: A wildlife biologist argues that reintroducing wolves to a national park will reduce deer overpopulation and restore ecological balance. Which of the following most weakens this argument?

Wolves are apex predators that historically occupied the region.
The park's terrain may not provide sufficient prey density to sustain a wolf population, causing wolves to leave or starve. (Correct answer)
Deer overpopulation has damaged vegetation in the park for decades.
Local ranchers have historically opposed wolf reintroduction.
Wolves were previously eliminated from the region due to human settlement.

Correct answer: The park's terrain may not provide sufficient prey density to sustain a wolf population, causing wolves to leave or starve.

If the park cannot sustain a wolf population, the wolves will not remain to control deer numbers, making the proposed solution unworkable and the conclusion unsound.

The biologist assumes wolves will successfully establish and maintain a stable population. Answer B challenges this by pointing out that insufficient prey density could prevent a sustainable wolf population. Without established wolves, the mechanism for deer population control fails entirely.

Question 12: A politician argues that stricter gun control laws will reduce gun violence because countries with stricter laws have lower rates of gun violence. Which of the following most weakens this argument?

Gun violence affects both urban and rural communities.
Those countries also differ from this country in poverty rates, cultural attitudes, and law enforcement practices. (Correct answer)
Gun ownership rates vary significantly across different regions.
Some gun control measures have bipartisan support.
The number of guns in circulation has increased over the past decade.

Correct answer: Those countries also differ from this country in poverty rates, cultural attitudes, and law enforcement practices.

The comparison fails to account for numerous confounding differences between countries, meaning gun laws alone cannot explain the different violence rates.

Cross-national comparisons are weakened by confounding variables. Answer B identifies multiple alternative explanations (poverty, culture, enforcement) that could account for different violence rates independent of gun laws. Without controlling for these, the international comparison cannot establish that gun laws specifically cause lower violence.

Question 13: A college administrator argues that offering more merit scholarships will increase the academic quality of incoming students because high-achieving students will choose this college over competitors. Which of the following most weakens this argument?

Merit scholarships are funded through the endowment.
Competing colleges are simultaneously expanding their own merit scholarship programs. (Correct answer)
Some high-achieving students prefer smaller class sizes over financial aid.
The college's graduation rate is above the national average.
Merit scholarships benefit students from all income levels.

Correct answer: Competing colleges are simultaneously expanding their own merit scholarship programs.

If all competing schools expand merit scholarships simultaneously, this college gains no competitive advantage and will not attract students it would not have otherwise.

The administrator assumes merit scholarships create a competitive advantage. Answer B introduces the arms-race problem: if competing institutions respond in kind, the relative attractiveness of this college's offer is unchanged, neutralizing the recruitment benefit and undermining the claim that academic quality will improve.

Question 14: A public health official argues that mandatory vaccination programs reduce disease outbreaks because high vaccination rates create herd immunity. Which of the following most weakens this argument?

Some vaccines require booster shots to maintain effectiveness.
The diseases targeted by the program have low transmission rates, meaning herd immunity thresholds may never be breached anyway. (Correct answer)
Mandatory programs may face legal challenges.
Vaccine hesitancy has increased in recent years.
Some people cannot be vaccinated for medical reasons.

Correct answer: The diseases targeted by the program have low transmission rates, meaning herd immunity thresholds may never be breached anyway.

If the diseases have low transmission rates and outbreaks are unlikely regardless of vaccination policy, the mandatory program may not be necessary to prevent outbreaks, weakening the causal claim.

The official links mandatory vaccination to reduced outbreaks through herd immunity. Answer B challenges the premise that outbreaks are a real risk: if natural transmission rates are too low to sustain outbreaks regardless, mandatory vaccination's role in preventing outbreaks becomes negligible, undermining the argument.

Question 15: A fitness trainer argues that high-intensity interval training (HIIT) is more effective for weight loss than steady-state cardio because HIIT burns more calories per minute. Which of the following most weakens this argument?

HIIT sessions are typically shorter than steady-state cardio sessions.
People who do HIIT tend to eat more after workouts, potentially negating the caloric advantage. (Correct answer)
HIIT requires expensive equipment.
Steady-state cardio is easier for beginners.
HIIT has been shown to improve cardiovascular health.

Correct answer: People who do HIIT tend to eat more after workouts, potentially negating the caloric advantage.

If increased appetite following HIIT causes greater caloric intake, the net caloric deficit from HIIT may be no better than or worse than steady-state cardio, undermining the weight loss advantage claim.

The trainer focuses solely on calories burned during exercise. Answer B introduces compensatory eating behavior: HIIT's greater intensity triggers greater hunger, potentially leading participants to consume more calories post-workout. Net caloric deficit—not calories burned during exercise—determines weight loss, so HIIT's per-minute advantage may evaporate.

Question 16: A journalist argues that violent video games cause aggressive behavior in teenagers because teens who play violent games exhibit more aggressive behavior than those who do not. Which of the following most weakens this argument?

Video game ratings are designed to guide parental decisions.
Teenagers who are already predisposed to aggression may be more drawn to violent games, rather than the games causing aggression. (Correct answer)
The video game industry generates billions of dollars annually.
Some violent games have educational components.
Parental supervision reduces the amount of time teenagers spend gaming.

Correct answer: Teenagers who are already predisposed to aggression may be more drawn to violent games, rather than the games causing aggression.

Reverse causation: pre-existing aggression may select for violent game preference, rather than game-playing producing aggression, breaking the proposed causal direction.

The journalist assumes the causal direction: games → aggression. Answer B proposes reverse causation: aggressive tendencies → preference for violent games. If pre-aggressive teens self-select into violent gaming, the observed correlation reflects selection bias rather than a causal effect of the games themselves.

Question 17: A mayor argues that installing surveillance cameras throughout the city will deter crime because criminals will know they are being watched. Which of the following most weakens this argument?

Surveillance cameras have been effective in some European cities.
Studies of cities that installed cameras show no statistically significant reduction in crime rates. (Correct answer)
Camera systems require ongoing maintenance and staffing.
Civil liberties groups have raised privacy concerns.
The cameras would record in high definition.

Correct answer: Studies of cities that installed cameras show no statistically significant reduction in crime rates.

Empirical evidence showing no significant crime reduction in cities that installed cameras directly undermines the deterrence claim, showing the theoretical mechanism doesn't produce the predicted outcome.

The mayor's argument is theoretical: visibility → deterrence → crime reduction. Answer B provides empirical evidence that this causal chain does not operate in practice. Real-world data from comparable implementations showing null results is strong evidence against the conclusion.

Question 18: A software engineer argues that switching to agile development methodology will reduce project delays because agile allows teams to identify problems early and adjust quickly. Which of the following most weakens this argument?

Agile methodology originated in software development in the early 2000s.
Many teams that switch to agile lack the training and cultural adjustment needed to implement it effectively, leading to greater confusion. (Correct answer)
Agile uses short development sprints rather than long planning phases.
Project managers often resist methodological changes.
Agile is used by many of the world's largest technology companies.

Correct answer: Many teams that switch to agile lack the training and cultural adjustment needed to implement it effectively, leading to greater confusion.

If teams lack proper training for agile implementation, the transition itself may introduce new inefficiencies and delays that exceed the benefits, undermining the conclusion.

The engineer assumes agile's theoretical benefits will materialize in practice. Answer B identifies an implementation gap: agile requires significant cultural and skill changes, and poorly executed agile transitions often produce worse outcomes than the systems they replace. The conclusion depends on effective implementation that may not occur.

Question 19: An economist argues that foreign aid to developing countries reduces poverty because recipient countries show economic improvement following aid disbursements. Which of the following most weakens this argument?

Foreign aid is often tied to requirements that recipient countries purchase goods from the donor nation.
Countries that receive aid also frequently receive concurrent trade deals, debt relief, and private investment that could independently drive economic improvement. (Correct answer)
Some aid goes to authoritarian governments.
Aid organizations have high administrative costs.
The UN recommends that developed nations contribute a percentage of GDP to foreign aid.

Correct answer: Countries that receive aid also frequently receive concurrent trade deals, debt relief, and private investment that could independently drive economic improvement.

Concurrent factors (trade deals, debt relief, private investment) could independently explain economic improvement, meaning aid's causal role cannot be established from the correlation alone.

The economist relies on temporal correlation: aid → economic improvement. Answer B identifies multiple simultaneous interventions that could produce economic improvement independently of aid. Without isolating aid's effect from these confounders, the causal claim is unsubstantiated.

Question 20: A school board argues that extending the school year to 200 days will improve student test scores because students in countries with longer school years consistently outperform students in countries with shorter school years. Which of the following most weakens this argument?

The additional school days would increase educational costs.
Countries with longer school years also tend to invest more per student, employ better-trained teachers, and have lower childhood poverty rates. (Correct answer)
Some students perform better in informal learning environments.
Teachers' unions may resist the extended calendar.
Test scores have been used to measure educational success for decades.

Correct answer: Countries with longer school years also tend to invest more per student, employ better-trained teachers, and have lower childhood poverty rates.

Confounding variables (investment, teacher quality, poverty rates) provide alternative explanations for superior performance, meaning the number of school days alone cannot be credited.

The school board uses cross-national comparison without controlling for confounders. Answer B identifies systemic differences that correlate with both longer school years and better performance. If wealthier countries with better educational infrastructure happen to have longer school years, adding days without these other improvements may produce no benefit.

Question 21: A transportation planner argues that implementing congestion pricing on downtown roads will reduce traffic because drivers will avoid tolled areas during peak hours. Which of the following most weakens this argument?

Congestion pricing has been implemented in Stockholm and London.
Many downtown commuters have no viable alternative transportation option and will continue driving regardless of the toll. (Correct answer)
Peak hour tolls are higher than off-peak tolls.
The revenue from tolls could fund public transportation improvements.
Traffic sensors can dynamically adjust toll rates.

Correct answer: Many downtown commuters have no viable alternative transportation option and will continue driving regardless of the toll.

If drivers have no alternatives and must reach downtown for work, price increases will not reduce their driving—inelastic demand undermines the behavioral change assumption.

Congestion pricing works by inducing mode-shift or temporal-shift. Answer B identifies that many commuters have captive demand—they must reach downtown and lack alternatives. For these drivers, tolls function as a tax without changing behavior, meaning congestion is not reduced, only made more expensive.

Question 22: A psychologist argues that therapy is effective for treating depression because patients who complete therapy courses report lower depression symptoms than before treatment. Which of the following most weakens this argument?

Several types of therapy, including CBT and DBT, are used for depression.
Depression often resolves naturally over time, so patients might have improved without any treatment. (Correct answer)
Some patients drop out of therapy before completing their course.
Therapy is often combined with medication.
The psychologist measured symptoms using a standardized scale.

Correct answer: Depression often resolves naturally over time, so patients might have improved without any treatment.

Natural remission means improvement could occur regardless of treatment, making it impossible to attribute recovery to therapy without a proper control group.

The argument confuses pre-post improvement with treatment efficacy. Answer B introduces the natural history of illness: depression is an episodic condition that often remits spontaneously. Without a control group of untreated patients, we cannot determine whether therapy caused the improvement or whether patients simply recovered naturally during the treatment period.

Question 23: A business analyst argues that companies with more diverse leadership teams generate higher profits because diverse teams make better decisions. Which of the following most weakens this argument?

Diversity includes multiple dimensions: gender, race, age, and experience.
More profitable companies may be better positioned to attract and retain diverse leadership candidates, reversing the causal direction. (Correct answer)
Many Fortune 500 companies have recently increased leadership diversity.
Board diversity requirements exist in some jurisdictions.
Decision-making quality is difficult to measure directly.

Correct answer: More profitable companies may be better positioned to attract and retain diverse leadership candidates, reversing the causal direction.

Reverse causation: financial success enables better recruitment, so profitability may cause diversity rather than diversity causing profitability.

The analyst infers: diversity → better decisions → higher profits. Answer B proposes the reverse: high profits → resources to implement diversity programs → diverse leadership. If successful companies recruit more broadly due to their attractiveness as employers, the correlation reflects reverse causation rather than diversity driving profit.

Question 24: A researcher argues that children who read more books have larger vocabularies, proving that reading causes vocabulary growth. Which of the following most weakens this argument?

Libraries provide free access to books for all income levels.
Children with larger vocabularies may find reading more enjoyable and therefore choose to read more, rather than reading building vocabulary. (Correct answer)
Vocabulary size correlates with academic achievement.
Some books are more vocabulary-rich than others.
Digital reading has increased among young children.

Correct answer: Children with larger vocabularies may find reading more enjoyable and therefore choose to read more, rather than reading building vocabulary.

Reverse causation undermines the argument: children with larger innate vocabularies may be more drawn to reading, not less—so reading frequency reflects prior vocabulary advantage rather than causing it.

The researcher assumes reading → vocabulary growth. Answer B proposes that children with strong verbal skills find reading more rewarding and self-select into more reading. If vocabulary predicts reading rather than reading causing vocabulary growth, the causal claim is unsupported by the correlation.

Question 25: A financial advisor argues that investing in index funds is the best strategy for most investors because index funds consistently outperform actively managed funds over 10-year periods. Which of the following most weakens this argument?

Index funds charge lower management fees than actively managed funds.
The 10-year period studied was characterized by a prolonged bull market that may not represent future market conditions. (Correct answer)
Many actively managed funds fail to beat their benchmark indices.
Index funds provide broad market diversification.
Warren Buffett has publicly endorsed index fund investing for most individuals.

Correct answer: The 10-year period studied was characterized by a prolonged bull market that may not represent future market conditions.

If the comparison period was an atypical bull market, past outperformance may not predict future results under different market conditions, weakening the recommendation.

The advisor extrapolates from historical data to future investment strategy. Answer B challenges the representativeness of the study period: a sustained bull market systematically favors passive strategies. In bear markets or highly volatile periods, actively managed funds might outperform. Conclusions about 'best strategy' based on unrepresentative periods are suspect.

Question 26: A criminologist argues that longer prison sentences deter crime because potential criminals weigh the costs and benefits before acting. Which of the following most weakens this argument?

Prison conditions affect rehabilitation outcomes.
Most crimes are committed impulsively or under the influence of substances, without rational cost-benefit calculation. (Correct answer)
Recidivism rates have remained stubbornly high despite increasing sentence lengths.
Prison is a significant cost to taxpayers.
Alternative sentencing programs have been implemented in some jurisdictions.

Correct answer: Most crimes are committed impulsively or under the influence of substances, without rational cost-benefit calculation.

If crimes are typically impulsive or substance-influenced, the rational deterrence model doesn't apply—potential criminals aren't making the calculations assumed by the deterrence theory.

Deterrence theory assumes rational prospective calculation. Answer B undermines this psychological premise: impulsive or intoxicated actors do not engage in cost-benefit analysis, so longer sentences cannot deter them. If most crimes bypass the rational mechanism entirely, the deterrence argument fails at its foundational assumption.

Question 27: An education researcher argues that smaller class sizes improve student achievement because teachers can give more individual attention in smaller classes. Which of the following most weakens this argument?

The Tennessee STAR study found benefits from smaller classes in early grades.
Schools that reduce class sizes must often hire less-experienced teachers to fill positions, which may harm student outcomes more than larger classes with veteran teachers. (Correct answer)
Student-to-teacher ratios vary widely across districts.
Class size reduction is popular with teachers and parents.
Some students learn better in larger, more dynamic group settings.

Correct answer: Schools that reduce class sizes must often hire less-experienced teachers to fill positions, which may harm student outcomes more than larger classes with veteran teachers.

If reducing class sizes requires hiring less-qualified teachers, teacher quality effects may outweigh class size effects, producing worse outcomes even with smaller classes.

The researcher focuses on the mechanism (individual attention) without considering implementation constraints. Answer B identifies a realistic tradeoff: the teacher labor market cannot instantly supply experienced teachers for all newly created positions. Research consistently shows teacher quality matters more than class size, so the net effect of smaller classes staffed by less-experienced teachers could be negative.

Question 28: A marketing executive argues that social media advertising is more cost-effective than television advertising because social media ads have higher measurable click-through rates. Which of the following most weakens this argument?

Television advertising reaches a broader demographic.
Click-through rates measure engagement but not actual purchases, and television advertising may generate higher purchase conversion rates despite fewer measurable interactions. (Correct answer)
Social media platforms offer detailed audience targeting capabilities.
Television advertising budgets have decreased over the past decade.
Many social media users are younger consumers with significant purchasing power.

Correct answer: Click-through rates measure engagement but not actual purchases, and television advertising may generate higher purchase conversion rates despite fewer measurable interactions.

Click-through rates measure only one step in the conversion funnel; if television ads generate more actual purchases per dollar, they could be more cost-effective despite lower measured engagement.

The executive equates click-through rates with cost-effectiveness. Answer B exposes a measurement gap: clicks are an intermediate metric, not a business outcome. If television advertising—despite lower measurability—produces more purchases per advertising dollar, it is more cost-effective by the relevant business standard, undermining the social media comparison.

Question 29: A politician argues that tax cuts will increase government revenue through economic growth because lower taxes encourage investment and spending. Which of the following most weakens this argument?

Tax rates affect both investment incentives and consumer spending.
Multiple rounds of tax cuts over the past 30 years have consistently produced budget deficits rather than the projected revenue increases. (Correct answer)
Some economists support supply-side tax theories.
Tax policy is complex and affects different income groups differently.
Investment decisions depend on multiple factors beyond tax rates.

Correct answer: Multiple rounds of tax cuts over the past 30 years have consistently produced budget deficits rather than the projected revenue increases.

Historical evidence that prior tax cuts produced deficits rather than increased revenue provides direct empirical evidence against the theoretical prediction, strongly weakening the argument.

The politician makes a theoretical supply-side argument (lower rates → more growth → more total tax revenue). Answer B provides historical falsification: repeated real-world applications of this policy have produced deficits rather than revenue growth. When empirical evidence consistently contradicts a theoretical prediction, the argument is substantially weakened.

Question 30: A pediatrician argues that children who participate in organized sports have better social skills than those who do not, because sports teach teamwork and cooperation. Which of the following most weakens this argument?

Team sports require coordination among multiple players.
Parents who enroll children in sports may also provide other social enrichment activities, making it difficult to isolate sports' specific contribution. (Correct answer)
Some sports, such as tennis and golf, are predominantly individual.
Not all children can afford to participate in organized sports.
Social skills are important for academic and professional success.

Correct answer: Parents who enroll children in sports may also provide other social enrichment activities, making it difficult to isolate sports' specific contribution.

Confounding parental behavior—parents who prioritize sports also tend to prioritize other social development—makes it impossible to credit sports specifically for better social skills.

The pediatrician attributes social skill development to sports participation. Answer B identifies a selection confound: sports-enrolling parents differ systematically from non-enrolling parents in ways that predict social skill development (more social activities, greater parental engagement). The observed association may reflect these parental characteristics rather than the sports themselves.

Question 31: An urban planner argues that mixed-use zoning (combining residential and commercial space) reduces car dependency because residents can walk to shops and services. Which of the following most weakens this argument?

Mixed-use developments typically have higher property values.
If mixed-use areas are developed in suburban locations far from employment centers, residents may still need cars to commute to work. (Correct answer)
Walking reduces carbon emissions compared to driving.
Several European cities have successfully implemented mixed-use zoning.
Mixed-use areas can increase neighborhood vitality and street activity.

Correct answer: If mixed-use areas are developed in suburban locations far from employment centers, residents may still need cars to commute to work.

If residents can walk to retail but still must drive to work—which is typically the largest travel demand—car dependency may not be meaningfully reduced.

The planner assumes walkable retail reduces overall car dependency. Answer B distinguishes retail proximity from employment proximity: commuting drives most vehicle miles traveled. Suburban mixed-use areas with walkable shops but car-dependent commutes do not reduce car dependency in the most significant dimension, undermining the conclusion.

Question 32: A biotech executive argues that genetically modified crops will eliminate world hunger because they produce higher yields than conventional crops. Which of the following most weakens this argument?

Genetically modified crops have been developed to resist pests and drought.
World hunger is primarily caused by poverty, political instability, and distribution failures—not by insufficient food production. (Correct answer)
Some countries have banned genetically modified crops.
Developing GM crops requires significant research investment.
Traditional crop breeding has also produced yield improvements.

Correct answer: World hunger is primarily caused by poverty, political instability, and distribution failures—not by insufficient food production.

If insufficient production is not the root cause of hunger, increased yields cannot solve it—the proposed solution addresses the wrong problem.

The executive assumes: more food → less hunger. Answer B challenges the underlying diagnosis: the world currently produces sufficient calories globally, yet hunger persists due to access, distribution, and political factors. If food insecurity stems from distribution rather than production shortfalls, yield increases do not address the actual bottleneck.

Question 33: A coach argues that athletes who visualize success before competing perform better because mental rehearsal reinforces neural pathways for physical performance. Which of the following most weakens this argument?

Visualization techniques have been adopted by many elite athletes.
Athletes who are already highly skilled and confident may be more likely to use visualization, rather than visualization causing their high performance. (Correct answer)
Mental preparation is considered important in sports psychology.
Visualization is used in therapy as well as athletic training.
The neural basis of motor learning supports the value of mental practice.

Correct answer: Athletes who are already highly skilled and confident may be more likely to use visualization, rather than visualization causing their high performance.

Selection bias: confident, skilled athletes are both more likely to use visualization and to perform well, so the correlation may not reflect a causal benefit of the technique.

The coach's argument assumes visualization causes better performance. Answer B reveals that high-performing athletes differentially adopt visualization—meaning observed performance differences may reflect pre-existing skill and confidence rather than the technique's effect. Without random assignment to visualization conditions, the causal claim is unsubstantiated.

Question 34: A policy analyst argues that raising alcohol taxes will reduce drunk driving fatalities because higher prices reduce alcohol consumption. Which of the following most weakens this argument?

Alcohol taxes have not been raised in many states for over a decade.
Problem drinkers who are most likely to drive drunk tend to have inelastic demand for alcohol and will absorb price increases without reducing consumption. (Correct answer)
Drunk driving fatalities impose significant costs on society.
Tax revenue from alcohol could fund transportation safety programs.
Public awareness campaigns have also been used to reduce drunk driving.

Correct answer: Problem drinkers who are most likely to drive drunk tend to have inelastic demand for alcohol and will absorb price increases without reducing consumption.

If the high-risk population (problem drinkers) has inelastic demand, price increases won't reduce their consumption and therefore won't reduce drunk driving among the most dangerous drivers.

The policy assumes higher prices → less consumption → less drunk driving. Answer B breaks this chain by identifying that the relevant population—problem drinkers and alcoholics—has highly inelastic demand for alcohol. They continue purchasing despite price increases, meaning the tax policy fails to change behavior in the group responsible for most drunk driving fatalities.

LSAT Logical Reasoning: Weaken the Argument Questions

A city council member argues that building a new highway through the suburbs will reduce downtown traffic congestion because commuters will have a faster route into the city.
Which of the following, if true, most weakens this argument?

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