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.