The correct option is D Both b and c
Emergency contraception is useful to prevent unwanted pregnancy.
Emergency contraceptives are used during unprotected intercourse and also during cases of sexual assault, rape.
Emergency contraceptive pills are very effective when used within 72 hours of coitus.
The pills contain levonorgestrel and prevent pregnancy by preventing ovulation and also by thickening the cervical mucus to make it difficult for the sperm to travel to the ovum.
No surgical procedure is involved in emergency contraception.