The following happens when a composer shortens a musical idea by using only a part of it: A. Fragmentation. B. Condensation. C. Variation. D. Repetition.

The correct answer is A. Fragmentation.<br /><br />When a composer shortens a musical idea by using only a part of it, it is referred to as fragmentation. Fragmentation involves breaking down a musical idea into smaller, distinct parts or fragments. This technique allows the composer to create new and varied musical ideas by rearranging, modifying, or combining these fragments in different ways.