50. The author mentions all of the following as evidence that dietary changes accompanied the expansion of Homo’s brainEXCEPT ________.
(A) the development of Homo’s delicate jaws and smaller molars in response to environmental change
(B) the higher calorie density found in foods Homo ate during the expansion, and their extra nutrients
(C) the development of a hunting-and-gathering economy beneficial to further brain growth
(D) the fossil record of Homo, and what it indicates about Homo’s progressive adaptation
(E) the fact that Homo was larger in terms of overall body size than its predecessors