Which of the Following Statements About Hominid Bipedalism Is Incorrect

Which of the following statements about hominid bipedalism is incorrect?

A) Stone tool manufacturing appears well over a million years after the emergence of bipedalism
B) Bipedalism first emerged as an adaptive response to predator pressure -- early hominids had to out-run predators to survive.
C) Bipedal walking is more energy efficient over long distances than quadrupedal walking
D) The emergence of bipedalism was an evolutionary compromise -- it brought both adaptive benefits and costs.
E) Bipedalism, with the weight of the trunk over the pelvis, places considerable biomechanical strain on the hips, lower back, knees, ankles and feet.