According to the primary source, animals were domesticated in certain ways in order to A be larger, B have keener sense, C is more useful to people, and D survive better in the wild.“Chickens were selected to be larger, wild cattle (aurochs) to be smaller. . . . Most domestic animals . . . have smaller brains and less acute sense organs than do their wild ancestors. Good brains and keen eyes are essential to survival in the wild, but represent a . . . waste of energy in the barnyard, as far as humans are concerned.”