Oral contraceptives are used by females to check
Birth control pills (oral contraceptives) check ovulation in female by inhibiting the secretion of FSH and LH that are necessary for ovulation.
A. Implantation- Stage of pregnancy in which embryo adheres to the wall of uterus.
B. Fertilization- Fusion of male and female gamete.
C. Ovulation- Release of eggs from the ovary.
So, the correct answer is 'Ovulation'.