Which statement correctly explains mechanical advantage?
A.
It is the factor by which a machine shortens the length of time needed to do a certain job.
B.
It is the number of times a machine multiplies the effort force put into the machine.
C.
It is the distance over which a machine can move an object in one minute, at a set speed.
D.
It is the amount of force needed by a machine to double the efficiency of the machine.
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