The answer is C. Barrier control methods of contraception are those that physically prevent the chances of fusion if egg and sperm. The birth control sponge is a form like substance inserted in the vagina and attached to the cervix and contains spermicide. The device physically closes the opening of the cervix so the sperm doesn’t pass to the uterus. The spermicide also deactivates the sperms. Other barrier control methods of contraception include condoms, diaphragm, and cervical cap.
Barrier methods of family planning are physical or chemical barriers that function to prevent conception. They have some advantages and disadvantages. For example some advantages of the diaphragm are that it has no effect on a woman's natural hormones, it can be used while breastfeeding beginning 6 weeks after birth. Some disadvantages are that there is increased risk of toxic shock syndrome if diaphragm is left in for more than 24 hours. Also it may have to be used in conjunction with another barrier method to enhance its efficacy.
