Answer:
Correct Answer:
d. was lower than men's in the 1950's, but has been the same as men's since the 1970's.
Explanation:
Since, in the wage earned by the people is determined by the level of education qualification of the citizen in question, it is expected that, those with college degree would earn higher than those without college degree.
In the 1950's, the women's college enrollment has been lower than men's. This has indirectly led to women earning lower wages than their male counterpart.