Why might a composer(musical) use silence in a piece of music?
a. to mark the formal structure
b. to represent an idea
c. to create dramatic tension
d. all of the above

I think that your real and true answer would MOST LIKELY be A.to mark a formal structure.formal music is silence.NO ONE IS SINGING.
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Ineed a picture or i cant answer this

The term collage was coined by both  georges braque  and  pablo picasso  in the beginning of the 20th century when collage became a distinctive part of modern art.hope this sorry if there wasn't more of an explanation!