Question

1. because symphony no. 40 in g minor, k. 550, i. molto allegro, is in sonata form, this means that the melody has one main melody, or theme, that is repeated, developed, and expanded upon three main melodies, or themes, that are repeated, developed, and expanded upon two main melodies, or themes, that are repeated, developed, and expanded upon four main melodies, or themes, that are repeated, developed, and expanded upon

Explanation:

Sonata - form typically has two main themes (an exposition with a first and second theme), which are then developed and recapitulated.

Answer:

two main melodies, or themes, that are repeated, developed, and expanded upon