Based on Fossil Evidence, What Is the Relationship Between the Evolution

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) Large brains preceded bipedalism by millions of years.
C) They co-evolved.
D) The first hominins had large brains and were quadrupedal, while later hominins had small brains and were bipedal.