What Was the Primary Benefit of the Bipedal Locomotion Adaptation

Multiple Choice

What was the primary benefit of the bipedal locomotion adaptation? It _______.

A) allowed our ancestors to bend down and hide
B) freed the hands so that they could be used for other things such as using tools and hunting
C) fostered brain development because the brain areas responsible for walking on all four legs were no longer needed
D) fostered social organization because walking upright allowed our ancestors to look at each other directly