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B
Block the entry of sperms into vagina
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C
Are implanted under the skin and they release progestron and estrogen
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D
Release copper ions in the uterus that increase phagocytosis of sperms
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Solution
The correct option is D Release copper ions in the uterus that increase phagocytosis of sperms An intrauterine device (IUD or coil) is a small contraceptive device. The one used by females is often 'T'-shaped, These IUDs suppress sperm motility and fertilising ability of sperm by releasing copper ions. Copper acts as a spermicide within the uterus.