On a Diet Consisting of Nothing but Protein, Which of the Following

On a diet consisting of nothing but protein, which of the following is the most likely outcome?

A) loss of weight because amino acids cannot be used for the synthesis of fat
B) muscle gain because the amino acids will go directly into building muscle
C) tiredness because amino acids cannot be used to generate energy
D) excretion of more nitrogenous (ammonia-derived) wastes than with a more balanced diet