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.

Option (B) is the correct answer.

Explanation:

When we apply force on an object then the movement or displacement of the object from its initial position is known as work.

For example, when we move a sofa from lobby to a room then it means work is done on sofa.

Therefore, in order for a work to be done it is necessary that the object must move from its initial position or place.

Thus, we can conclude that the object must move should occur in order for work to be done.