Often a Woman May First Suspect She Is Pregnant When

Often a woman may first suspect she is pregnant when she misses her period,which is due to

A) chorionic gonadotropin causing the corpus luteum to continue producing progesterone inhibiting GnRH release.
B) chorionic gonadotropin blocking the corpus luteum from producing progesterone inhibiting GnRH release.
C) follicle-stimulating hormone causing the corpus luteum to continue producing progesterone inhibiting GnRH release.
D) follicle-stimulating hormone blocking the corpus luteum from continuing to produce progesterone inhibiting GnRH release.
E) luteinizing hormone blocking the corpus luteum from continuing to produce progesterone inhibiting GnRH release.