The Underlying Cause of Premenstrual Syndrome (PMS)

The underlying cause of premenstrual syndrome (PMS)

A) is the relatively high levels of progesterone during the premenstrual phase of the cycle.
B) is the relatively low level of estradiol during the premenstrual phase of the cycle.
C) results from and combination of the hormonal action described in choices a and b
D) bears little relationship to hormonal variations during the cycle.