The correct option is A a small part of the fallopian tube is removed or tied up
Tubectomy is the method of sterilization in which small part of the fallopian tube is removed or tied up.
When both ovaries and both Fallopian tubes are removed, the term bilateral salpingo-oophorectomy (BSO) is used.
Vasectomy is the method of sterilization in which small part of vas deferens is removed or tied up.
Hysterectomy is the method when the uterus is removed surgically.