How Did Employers Justify the Disparity of Paying Female Workers

How did employers justify the disparity of paying female workers half or less than half of the wages earned by men?

A) Women spent more time at home completing "finishing" work than in the workplace.
B) Women were responsible for more accidents in the workplace than men.
C) Women lacked the education needed to perform many of the unskilled jobs that men did.
D) Women merely worked for extra money, while men worked to support their families.