The correct answer is (b) Progesterone
Best explanation: Oral administration is hormonal shots of progesterone, estrogen, and their combinations. These are contraceptives for females. Progesterone is normally released by corpus luteum in the case of an unfertilized egg to prevent further development of the uterine wall and to stimulate contractions of the uterus to expel the egg. Progesterone shots do the same job and forces the fertilized egg out in the form of menses.