Doppio Movimento which is from Appalachian Spring, composed by Aaron Copeland is a C. set of variations.
Doppio Movimento is one of the eight sections of the musical piece Appalachian Spring by Aaron Copeland and it is based on the Shaker theme, "Simple Gifts."
Doppio Movimento is basically a set of variations that that tell a story of the daily activities of a Bride and her husband who is a farmer.
In conclusion, option C, Set of variations, is correct.
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