Question

which is occurring when work is being done?
energy is being reverted.
energy is being decreased.
energy is being increased.
energy is being transferred.

Explanation:

When work is done, according to the work - energy theorem, energy is transferred from one object or system to another. For example, when you push a box, you do work on the box. Your muscular energy is transferred to the box (as kinetic energy if it starts moving). Reverting energy is not a standard concept in the context of work. Energy is not just decreased or increased in a general sense when work is done - it is transferred.

Answer:

Energy is being transferred.