The correct option is A vasectomy
Sterilisation is a permanent method of birth control.
Vasectomy is a surgical method for male sterilization or permanent contraception. During the procedure, the vas deferens are cut, seperated and tied to prevent sperm entry into the urethra. This prevents fertilization of a female egg through sexual intercourse.
In tubectomy a piece of fallopian tube is cut and the cut ends are tied. Therefore the sperms are not able to reach the egg.
Colectomy is the surgical removal of all or a part of colon.