46. The author is primarily concerned with ________. (A) contrasting the characteristics of Homo and his primate ancestors (B) analyzing the evolutionary basis for the development of the modern human diet (C) disproving the view that bipedalism alone can account for the human brain’s evolution (D) describing a relationship between the acquisition of an improved diet and the development of the human brain (E) demonstrating the importance of brain growth in developing human social behavior, foraging tactics and better diet.