Australopithecus Sediba, a New Fossil from South Africa, Is Considered

Australopithecus sediba, a new fossil from South Africa, is considered by some paleoanthropologists to be a bridge between australopithecines and the human lineage. This is because

A) Australopithecus sediba is the oldest fully bipedal ape fossil.
B) Australopithecus sediba shows a mix of ape features and humanlike features.
C) Australopithecus sediba is younger than Homo erectus.
D) Australopithecus sediba had a human-sized brain but still lived in trees.
E) many researchers suspect that there was genetic admixture between Australopithecus sediba and Homo populations.