Which of the Following Statements About the Gender Gap in Income

Which of the following statements about the gender gap in income is CORRECT?

A) The typical woman in the U.S. earns about 75% as much as the typical man.
B) In higher education, women are under-represented in more lucrative majors such as physics and chemistry.
C) Gender discrimination against women resulted in an excess supply of female workers in female-dominated occupations.
D) all of the above