The diagram shows embryo development of four different animals. How is this evidence used to suggest that life changes over time?

A: Similarities in embryonic development prove that vestigial structures are common to all species, and life has changed very little over time.

B: The genetic inheritance of each of these species is exactly the same in the early stages of development but then changes as the embryo grows and develops over time.

C: Lack of homologous structures in later stages of embryonic development indicate that each species is unique, and a common ancestor is unlikely.

D: When there are physical similarities in the early stages of embryonic development, it suggests that each of the modern organisms once had a common ancestor.