Atubal ligation is a permanent sterilization procedure in which a woman's fallopian tubes are blocked or severed. which of the following explains how this process can be used to prevent pregnancies?
a: it prevents sperm from reaching the egg and fertilizing it.
b: it prevents the maturation of the follicle and the release of an egg.
c: it prevents a zygote from being implanted into the uterine wall.
d: it prevents the thickening of the walls of the uterus.