Select the Correct Statement About the Uterine Cycle

Select the correct statement about the uterine cycle.

A) During the secretory phase, estrogen levels are at their highest.
B) If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo.
C) During the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone.
D) The menstrual phase of the cycle is normally from day 1 to day 8.