Which Statement About Cleavage and Early Development in Placental Mammals

Multiple Choice

Which statement about cleavage and early development in placental mammals is true?

A) Cells of the inner cell mass initiate implantation.
B) Premature hatching of the blastocyst from the zona pellucida can result in ectopic pregnancy.
C) Mammalian cleavage produces a blastocyst, which produces the body of the embryo, while the maternal tissues produce all the tissues of the placenta.
D) Cells of the trophoblast are pluripotent stem cells.
E) Cells derived from the trophoblast form the amnion and yolk sac.