Acomposer wants to create the largest contrast possible following a diminuendo. she will most likely follow the diminuendo with a a. decrescendo. b. crescendo. c. pianissimo. d. ritardando

I believe it's B. Crescendo.

A crescendo is a gradual increase to the highest or loudest point, while diminuendo is the complete opposite.  So the composer wants to contrast these two very different textures.

BONUS: A slow movement's has a contrast that is usually fast that is placed in the middle or end.

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the previous answer given.