Answer:
The correct answer would be A. burned for energy.
When body cannot get enough energy from the carbohydrate and fats storage present in the body, it switches to the oxidation of protein for the production of energy.
Oxidation of proteins can provide 4 calories per gram.
The different amino acid can enter at different levels of cellular respiration. For example, alanine and cysteine are converted into pyruvate which then enters the cellular respiration et cetera.