In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The results expected was :

Question

( A ) High level of circulating HCG to stimulate endometrial thickening
( B ) High levels of FSH and LH in uterus to stimulate endometrial thickening
( C ) High level of circulating HCG to stimulate estrogen and progesterone synthesis
( D ) High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo