Doug is doing work. without knowing exactly what he is doing, which can be said about the work he is doing? energy is transferred. energy is increased. energy is decreased. energy is unchanged.

energy is being transferred.

1) You must always rely in the law of energy conservation: energy is neither created nor destroyed. Energy only is transformed.

2) Doing work is transfering one form of energy into another.

For example, when you raise an object you transform the chemical energy stored in your muscles into kinetic energy that is transferred to the object. Later, that kinetic energy may transfor into potential energy or heat (by friction).

Then, even though you do not know exactly what Doug is doing,you can certainly say that energy is being transferred.