Select the correct option describing gonadotropin activity in a normal pregnant female:
- AHigh level of FSH and LH stimulates the thickening of endometrium.
- BHigh level of FSH and LH facilitate implantation of the embryo.
- CHigh level of hCG stimulates the synthesis of estrogen and progesterone.
- DHigh level of hCG stimulates the thickening of endometrium.