Which of the Following Observations Supports the Claim That Ancestors

Which of the following observations supports the claim that ancestors of snakes had legs?

A) We see vestigial scales on the ventral side of snakes.
B) Snakes have the ability to swim.
C) It is much easier to escape predators if you have legs.
D) Skeletons of some snakes retain vestiges of a pelvis and leg bones.
E) Snakes with long legs left fewer offspring.