Which statement describes the biological action of the oestrogen/progesterone contraceptive pill?

A. Increased concentrations of the hormones increase the thickness of the endometrium of the uterus.

B. Increased concentrations of the hormones prevent the shedding of the endometrium of the uterus.

C. Increased concentrations of the hormones stimulate a surge in the secretion of LH from the anterior pituitary gland.

D. Increased concentrations of the hormones suppress the secretion of FSH and LH from the anterior pituitary gland.