Catabolism of Protein Is Not a Practical Source of Quick

Catabolism of protein is not a practical source of quick energy because of all of the following, except that

A) extensive catabolism of protein threatens homeostasis.
B) one of the by- products of protein catabolism is ammonia.
C) proteins are more difficult to break apart than lipids or carbohydrates.
D) most individuals have little protein to spare before harming vital organs.
E) the energy yield from protein is less than the yield from lipids.