Often a Woman May First Suspect She Is Pregnant When

Often a woman may first suspect she is pregnant when she misses a period or menstrual cycle.What causes a pregnant woman to miss a period?

A) Chorionic gonadotropin causes the corpus luteum to produce progesterone.
B) Chorionic gonadotropin blocks the corpus luteum from producing progesterone.
C) Follicle-stimulating hormone causes the corpus luteum to produce progesterone.
D) Follicle-stimulating hormone blocks the corpus luteum from producing progesterone.
E) Luteinizing hormone blocks the corpus luteum from producing progesteronE.