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

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