Which of these provides evidence from developmental blology of a shared evolutionary history?

a. the dna sequences of the cytochrome c genes in chimpanzees and spider monkeys are over 90% identical

b. the skeletal structure of a leg of a horse and a flipper of a whale are very similar

c. both snakes and dogs have pelvical bones even though they are vestigial structures of the snake

d. both lobsters and frogs go through metamorphosis as a process in their life cycle