Will Eating a Diet That Contains Only Protein Prevent a Person

Will eating a diet that contains only protein prevent a person from increasing their amount of body fat,regardless of how much they eat?

A) Yes; protein is broken down to form amino acids,which can only be used to form new proteins.
B) Yes; fat can be formed from glucose or fatty acids,but not amino acids.
C) No; breakdown products from amino acids can enter the citric acid cycle,or be converted into acetyl CoA,pyruvic acid,or glucose.