Which hypothesis is supported by the characteristics of Lucy and other Australopithecus afarensis?a. Bipedalism did not arise until the origin of Homo sapiens.b. All hominins are in the genus Homo.c. Hominin evolution began with enlargement of the brain, leading eventually to bipedal walking because the hands were needed for other tasks.d. Bipedalism arose very early in hominin evolution, prior to enlargement of the brain.