The correct answer is C.Sponge
Explanation,
Sponge is a small soft sponge made of plastic foam that is inserted in the vagina before sex.It prevents pregnancy by covering the cervix so that the sperms cannot pass to the uterus and also releases spermicides to immobilize the sperm.It does not affect the hormone levels.The spermicides released by the sponge may cause vaginal dryness and irriration.The other effects are discharge from the vagina,itching of the genitals and vaginal burning.