okay so I know the human body uses the energy sources carbohydrates, lipids, and proteins but why does the human body use them in that order ?

carbs are the simplest of the macromolecules. for most instances carbs are used for a quick flash of energy meanwhile lipids store energy so it is a better and longer lasting source of fuel so if you run out of primary carbs you go to your secondary energy source- lipids. Proteins are used to replenish.

the answer to your question is b