How did world war i impact women in the united states?
a. women received equal pay for equal work.
b. women were prohibited from working as red cross volunteers.
c. women worked jobs that had been held almost exclusively by men.
d. women no longer held traditional jobs such as nursing or teaching.

Probably the most important change that happened at the time was that C - Women worked jobs that had ben held almost exclusively by men. 

Due to the fact that the majority of men, or at least a good portion of them, were on the battlefield in Europe, women had to take over the role in certain key areas that were necessary for the victory of the US.