Which of the following must occur in order for work to be done?

A. The object must use a machine.

B. The object must move.

C. The object must make another object move.

D. The object must not move.

When a force is applied to an object makes the object to move, work is done by the force.

force is exerted and the object moves a distance d in a direction other than the direction of the force, less work is done than if the object moves a distance d in the direction of the applied force.

w=fdcos theta

B. The object must move.