Which of the Following Statements Is True Regarding Protein Intake

Which of the following statements is true regarding protein intake recommendations?

A) Athletes may need slightly more protein than other healthy adults.
B) Athletes build muscle only when they consume excess protein supplements.
C) Dieters should take excess protein supplements to spare body proteins.
D) Infants and children need the same amount of protein as adults on a per-kilogram basis.
E) Protein recommendations are based strictly on age and gender.