Which of the Following Is True About the Parts of the Blastocyst

Which of the following is true about the parts of the blastocyst that begin to develop into organs that protect and nurture the embryo?

A) The placenta is a fluid-filled membrane that encases the developing embryo, giving it room to move.
B) The mesoderm and the endoderm produce the hormones that provide nutrition to the embryo.
C) The placenta plays a role in the elimination of wastes from the embryo.
D) The amniotic sac develops in the uterus to allow oxygen and wastes to pass between the mother and the embryo.