The correct option is A Fertilization
Sterilization provides permanent and sure birth control. It is called vasectomy in men and tubectomy in women. It involves the removal of a short segment of vas deferens in the male and fallopian tubes in females, respectively and tying up of the remaining ends tightly with surgical thread. So, tubectomy is a surgical procedure for sterilization in which a woman's fallopian tubes are clamped and blocked, or severed and sealed, which blocks egg from sperm, thereby preventing fertilization.