The correct option is C IUDs offer a protection from sexually transmitted diseases.
IUDs are made up of metal like copper or plastic. They are inserted or removed by certified healthcare providers. The primary mechanism of an IUD is based on the fact that it is a foreign object in the uterus. This stimulates a foreign body reaction in the uterus, causing an inflammatory reaction, increasing the release of WBCs and prostaglandins. These attack incoming sperm and create a hostile environment. They also induce changes in the endometrium, which make it unsuitable for implantation.
IUDs do not provide any protection against sexually transmitted diseases.