One of the legal methods of birth control is
(a) abortion by taking an appropriate medicine
(b) by abstaining from coitus from day 10-17 of the menstrual cycle
(c) by having coitus at the time of day break
(d) by a premature ejaculation during coitus
(b) One of the legal method of birth control is periodic in which couple abstain from coitus from day 10 to 17 of the menstrual cycle. Abortion by taking medicine is not a legal method. A day break coitus may increase the changes of contraception.