The ratio of output force to input force of a simple machine is called the
a) mechanical advantage.
b) fulcrum.
c) pivot point.
d) efficiency.
e) lever arm.

option A

Explanation:

The ratio of the output of the work to the ratio of the total work input is equal to Efficiency.

Fulcrum is the pivot point from which the liver turns.

In the absence of Fulcrum the Center of gravity act as a pivot point of an object which is resting on the horizontal plane.

Whereas the ratio of output force to the input of a simple machine is equal to mechanical advantage.

The correct answer is option A

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

harry byrd declared organized resistance by southern states would prevent racial integration.