Which of the following is a correct statement?

Option (c) is correct as Intrauterine Devices (IUDs) increase phagocytosis of sperms within the uterus and the $\mathrm{Cu}$ ions released suppress sperm motility and fertilising capacity of sperms. Other statements can be corrected as IUDs can be removed as these are a reversible contraception method. IUDs are inserted by doctors or expert nurses in the uterus through vagina. IUDs do not affect gametogenesis.