What Prevents Menstruation from Occurring in the 10^th Week When

Multiple Choice

What prevents menstruation from occurring in the 10^th week when the corpus luteum regresses?

A) The follicle takes over secretion of hCG.
B) The follicle takes over secretion of estradiol and progesterone.
C) The placenta takes over secretion of estradiol and progesterone.
D) The cervix takes over secretion of oxytocin and prostaglandins.