Which of the following accurately describes how certain forms of estrogen-based oral contraception work to prevent pregnancy?
a. Increased concentrations of estrogen in the blood can inhibit the release of Follicle-stimulating and Luteinizing Hormones from the anterior pituitary gland, thus preventing maturation of the follicle.
b. Increased concentrations of estrogen can act directly on the ovaries to prevent the maturation of a follicle that typically occurs over the course of the menstrual cycle.
c. Increased concentrations of estrogen can act directly on the uterine lining to prevent thickening of the endometrium in preparation for implantation of the egg.
d. Increased concentrations of estrogen work to lower the pH in the vagina, thus creating a more hostile environment for incoming spermatozoa.
e. None of the above