How does a diaphragm prevent pregnancy select one of the options below as your answer:
a. it releases spermicide into the uterus to keep sperm from fertilizing eggs.
b. it produces hormones that keep a woman's ovaries from releasing eggs.
c. it covers the penis to keep it from releasing sperm into the vagina.
d. it blocks the cervix in order to keep sperm from entering the uterus?