Which of the following is true regarding gender segregation?

A) Most women work in occupations that have roughly equal numbers of male and female employees.
B) Men are concentrated in fewer occupations that women.
C) The greater the concentration of women workers in an occupation, the lower the pay.
D) Legislation has had little effect on gender segregation.

Studies have shown that there is a strong correlation between the concentration of women workers in an occupation and lower pay. This is known as the "glass ceiling" effect, where women are limited in their career advancement and earning potential due to gender segregation in certain fields. Option A is incorrect as women are still underrepresented in some male-dominated fields like STEM. Option B is also incorrect as there are still many occupations that are dominated by men. Option D is not entirely true as legislation has had some impact in reducing gender segregation, such as affirmative action policies and anti-discrimination laws.