Proponents of the "alternative explanation" argue that A. employers have difficulty persuading qualified women to enter relatively high-paying occupations B. women choose undemanding jobs because they wish to keep their career options open C. women will flood domestic occupations D. salaries in female-dominated occupations will decrease as more women are forced into those occupations by their exclusion from others E. women's choice of occupation is irrelevant since they have always made less money than men and are likely to continue to do so