Based on fossil evidence, what is the relationship between the evolution of bipedalism and large brains in hominin evolution?
A) Bipedalism preceded large brains by millions of years.
B) The first hominins had small brains and were quadrupedal, while later hominins had large brains and were bipedal.
C) They co-evolved.
D) Large brains preceded bipedalism by millions of years.
