Assuming Competitive Labor Markets,occupational Segregation by Sex

Assuming competitive labor markets,occupational segregation by sex:

A) increases the profits of firms that discriminate
B) is beneficial from society's standpoint,because the gains to male employees outweigh the losses to female employees
C) results in an inefficient allocation of labor and diminished output
D) cannot persist,as employers will find it in their best interest to hire only female employees