Bipedal Behavior and a Skeleton Adapted for Bipedalism Were Not

Bipedal behavior and a skeleton adapted for bipedalism were not weeded out by natural selection because they

A) improved stability during locomotion.
B) enabled the forelimbs to efficiently manipulate the environment.
C) accelerated the development of binocular vision.
D) improved stability during locomotion and enabled the forelimbs to efficiently manipulate the environment.
E) improved stability during locomotion, enabled the forelimbs to efficiently manipulate the environment, and accelerated the development of binocular vision.