To solve this problem, we need to match the contraceptive methods in List I with their corresponding descriptions in List II. Let's analyze each method:$\newline \bullet$a. Vaults:$\newline$ - Vaults are barrier methods of contraception that prevent the entry of sperm through the cervix.$\newline$ - This matches with (i) Entry of sperm through Cervix is blocked.$\newline \bullet$b. IUDs:$\newline$ - Intrauterine devices (IUDs) are inserted into the uterus and can cause phagocytosis of sperms within the uterus.$\newline$