Answer:
The correct options is A.
Step-by-step explanation:
The major source of energy in human is carbohydrate, but the body can also use fat and protein for energy production. The human body usually use protein for energy production when there is shortage of carbohydrates and fat. The body typically remove the nitrogen portion of the protein and use the remaining portion as body fuel. If the body continue to use protein as a source of energy for a long time, it leads to depletion of body muscles.