Birth control pills containing combinations of synthetic estrogen and progesterone compounds that are given for the first 21 days of the menstrual cycle are effective in preventing pregnancy. What is...

Birth control pills containing combinations of synthetic estrogen and progesterone compounds that are given for the first 21 days of the menstrual cycle are effective in preventing pregnancy. What is the explanation for their efficacy?

A) Prevention of the preovulatory surge of LH secretion from the pituitary gland B) Prevention of development of the ovarian follicles C) Suppression of the function of the corpus luteum soon after it forms D) Prevention of normal development of the endometrium