The Presence of Vestigial Hip and Leg Bones in Boas

Multiple Choice

The presence of vestigial hip and leg bones in boas and pythons is considered evidence for what evolutionary link?

A) A snake was the common ancestor for the tetrapods.
B) Snakes have limbed ancestors.
C) Some snake species needed limbs probably for evading predators by climbing.
D) None,because with the new molecular genetics studies,the presence of vestigial structures is irrelevant to evolutionary biology.