In Times of Energy Shortage from Carbohydrates or Fats in Foods

In times of energy shortage from carbohydrates or fats in foods, the body uses protein in what way?

A) decreases the breakdown of food proteins for energy and uses stored glycogen
B) stores amino acids in the cells to be used later for energy
C) removes the nitrogen portion and burns the remaining fragments for energy
D) converts it to fat to provide more concentrated energy