How do simple machines make work easier?

A. They add energy to the work.

B. They increase the force needed to work.

C. They reduce the speed of work.

D. They increase the distance over which a force is applied.

work is defined as force acting on an object in the direction of motion, a machine makes work easier to perform by accomplishing one or more of the following functions: transferring a force from one place to another, changing the direction of a force, increasing the magnitude of a force, or increasing the distance or speed of a force

D. They increase the distance over which a force is applied.