Which Explanation of the Gender Gap in Pay Does the Author

Which explanation of the gender gap in pay does the author of your text espouse?

A) Human capital is the best explanation of the wage gap.
B) Wage inequality is the result of multiple factors that operate together to put women at a disadvantage.
C) Dual labor market theory offers the best explanation for unequal wages.
D) Overt discrimination is the best explanation for the gender wage gap.