Choose the right one among the statements given below:

IUDs - Intra Uterine Devices (IUDs) are devices inserted by doctors or expert nurses only in the uterus through vagina. So option (a) is not correct.

IUDs do not suppress gametogenesis this takes place in the ovary, while lUDs are inserted in the uterus. So option (c) is not correct.

IUDs need to be replaced if required. IUDs comes for a specific period of time. So, option (d) is incorrect.

Non-mediated IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms.

So the correct answer is option (b).