Even though marsupial mammals give birth to live young, an eggshell forms briefly early in their development. This is evidence that _________.

A. Marsupials share a common ancestor with some egg-laying species;

B. Marsupials are not really mammals;

C. All animals arose from a common ancestor;

D. Marsupial mammals were separately created by God;

E. The fossil record of marsupial mammals is incorrect