There Is a Debate Over How Much of the Female-Male

There is a debate over how much of the female-male wage gap is due to differences in labor market differences. What is one reason why this is highly debated?

A) Men and women vary greatly in their education levels.
B) There is little evidence that men and women have different labor market experience after conditioning on age and education.
C) Men and women vary greatly in their productivity.
D) Even if, conditioning on age, women have less labor market experience than men, this difference itself may be due to discrimination.
E) Men and women willingly choose to work different occupations.