The Oral Contraceptive Pill,informally Called "The Pill" Contains an Estrogen

The oral contraceptive pill,informally called "the pill" contains an estrogen and progesterone or a synthetic mimic of this hormone.The combination of these two hormones taken in the pill and circulating in the blood work because.

A) The hormones cause the woman's body to mimic the activities of a pregnancy and disrupt the ovarian cycle, preventing ovulation.
B) The hormones create an acid condition in the vagina that acts as a spermicide.
C) The hormones prevent the proliferative or secretory phase of the menstrual cycle and the embryo will have no place to implant.
D) The hormones cause a thickening of the mucus plug at the cervix that prevents sperm from penetrating the womb and reaching the ovulated egg.