BM or BMus Bachelor of Music FREE BM or BMus Bachelor of Music Musical Form and Analysis Questions and Answers

An analyst is examining the first movement of a Classical symphony.
After the primary theme in the tonic key, a modulatory bridge leads to a new, lyrical theme in the dominant key.
This second theme is then followed by a strong closing theme, also in the dominant, which solidifies the new key before a repeat sign.
Which section of sonata form has the analyst just described?