Which statement best describes why a machine is useful?
A-A machine does a greater amount of work than the amount of work that is done on it.
B-A machine does a smaller amount of work than the amount of work that is done on it.
C-A machine can decrease both the input force and the input distance needed to do a given amount of work.
D-A machine can decrease either the input force or the input distance needed to do a given amount of work.
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