47. It can be inferred from the passage that chimpanzees are characterized by ________.
(A) a higher ratio of brain weight to body weight
(B) a total resting energy equal to that of human resting energy
(C) brains that use less overall body energy than do human brains
(D) the possession of less total body weight than the average human weight
(E) a diet completely devoid of rich foods preferred by more developed species