The correct option is C orchiectomy
Surgical removal of gonads is a permanent method of birth control. Gonads are the primary sex organs responsible for formation of gametes and sex hormones.
Surgical removal of the gonads (both testes and ovaries) is generally called gonadectomy.
Surgical removal of male gonads or testes is called orchidectomy or orchiectomy and prevents the formation of sperms.
Surgical removal of female gonads or the ovaries is called ovariectomy or oophorectomy. This prevents formation of female gametes or the ova.
The surgical removal of uterus is called hysterectomy. The surgical method of cutting and sealing of vas deferens is called vasectomy. This prevents the transport of sperms from the testes to the ejaculatory duct.