A surgical method which prevents pregnancy by preventing sperms from reaching ovum is

Foeticide is the act of aborting a foetus.
Copper-T is an intrauterine device that some women use for birth control. It is a barrier. It is inserted high in the uterus by a physician, and provides enhanced contraceptive protection for up to ten years. Copper IUDs actually prevent fertilization by reducing the number and viability of sperms reaching the egg, and by impeding the number and movement of eggs into the uterus. It is believed that the continuous release of copper from the coils and sleeves of the Copper T 380A into the uterine cavity enhances the contraceptive effect of the IUD.
Vasectomy is a surgical procedure where the male vasa deferentia are severed and then tied/sealed in a manner so as to prevent the sperm from entering into seminal stream thereby preventing fertilization.
Tubectomy is the surgical procedure in which a woman's fallopian tubes are clamped and blocked or severed and sealed, either of which prevents the eggs from reaching the uterus for implantation.
Thus, the correct answer is option (C), 'Vasectomy'.