Which Statement Describes a Difference in the Development of Marsupial

Multiple Choice

Which statement describes a difference in the development of marsupial versus eutherian (or placental) mammals?

A) Marsupial young are ejected at the end of the estrous cycle, as the corpus luteum is not maintained.
B) Marsupials undergo a longer gestation, hence the long time spent in the pouch.
C) Only eutherians are born with well-formed jaws, gut, and forelimbs.
D) Marsupials hatch from an egg, whereas eutherians are born.