Which of the Following Is Not an Assumption Made in the Formulation

Which of the following is not an assumption made in the formulation of the RDA for protein? 

A)  People are healthy and do not have unusual metabolic needs for protein. 
B)  Dietary protein is of mixed quality. 
C)  Dietary carbohydrate and fat intakes are adequate. 
D)  The body will use protein efficiently. 
E)  Dietary protein needs are lower in infants and children.