Final answer:
The development section of a movement of music is typically found in the middle of the piece, but closer to the top. It is a section where the composer expands and develops the themes introduced in the exposition. Therefore, the correct option is B. In the middle.
Step-by-step explanation:
The development section of a movement of music can be found in the middle of the piece, but generally closer to the top. It is a section within a larger musical form where the composer expands and develops the themes introduced in the exposition. This section typically includes modulations, variations, and the exploration of new musical ideas before transitioning back to the main themes in the recapitulation.