Possible Explanations for the Income Differences Between Men and Women

Possible explanations for the income differences between men and women include all but which one of the following?

A) Women are disproportionately employed in lower-paying, lower-status occupations.
B) Women leave the labor market to care for children and elderly parents and then re-enter it.
C) Women underestimate their worth to employers and ask for less than their male counterparts.
D) Men's earnings are largely viewed as supplemental to women's.