Which of the following statements about premenstrual dysphoric disorder (PMDD) is true?
a. It seems likely that in many cases the difference between women who have PMDD and those who don’t is due to a differences in how they respond to estradiol and progesterone
b. Women who have PMDD have levels of estradiol and progesterone that are higher than those of women who do not have PMDD
c. Women who have PMDD have levels of estradiol and progesterone that are lower than those of women who do not have PMDD
d. The symptoms get worse when menstrual cycles are stopped