The correct option is D A, C & D
Natural birth control is a method of preventing pregnancy without the use of medications or physical devices.
Periodic abstinence, withdrawl, coitus interruptus and lactational amenorrhea are all natural methods of contraception which work on the principle of avoiding chances of ovum and sperm meeting.
Periodic abstinence - abstain from coitus from day 10 to 17 of the menstrual cycle when ovulation could be expected.
Withdrawal or coitus interruptus is another method in which the male partner withdraws his penis from the vagina just before ejaculation.
Lactational amenorrhea (absence of menstruation) method is based on the fact that ovulation and therefore the cycle do not occur during the period of intense lactation following parturition.