What Was the Main Reasons Unions Advocated Equal Pay for Women

What was the main reasons unions advocated equal pay for women workers during the war?​

A) ​They wanted to maintain wage levels for men who would return to jobs after the war.​
B) ​They wanted to encourage more women to fill jobs left by men going off to war.​
C) ​They came to recognize women workers as vital to war production.​
D) ​Once they saw that women could work as hard as men, they thought they should be paid as men.​
E) ​They realized that many women had become primary breadwinners for their families.​