Which of the Following May Have Been an Advantage Bipedal

Which of the following may have been an advantage bipedal hominins had over their non-bipedal counterparts?

A) Bipedal hominins may have been able to see potential enemies over greater distances.
B) Bipedal hominins could outrun non-bipedal creatures over short distances.
C) Bipedal hominins had larger brains than quadrupeds and were able to hunt for food more successfully as a result.
D) Bipedal hominins exposed a larger portion of their bodies to the sun than quadrupeds and were able to stay warmer for longer periods of time as a result.