A tubal 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.