Which of the Following Is a Feature of Protein Nutrition

Which of the following is a feature of protein nutrition?

A) Protein in body tissues is preserved fairly well on low-energy diets
B) The protein RDA assumes that dietary protein is from a mix of low- and high-quality sources
C) Many people in the United States and Canada consume somewhat less protein than is needed
D) Athletes in training benefit from increasing their protein energy intake to 45-50% of total daily energy