Choose the best answer:
Why is it important to use contraceptive methods?
a. Contraceptive methods are adopted primarily to avoid unintended pregnancies.
b. One of the reasons for using contraception is to increase overpopulation.
c. Spreading of sexually transmitted diseases is one of the reasons for using contraception.
d. The reasons for using contraception include maximizing the adverse effects on the mother's body caused by frequent pregnancy.