Why Were American Women Encouraged to Work Outside the Home

Why were American women encouraged to work outside the home during World War II?

A) The second wave of the feminist movement led to women finally been seen as capable workers.
B) There was a scarcity of workers as a lot of men had been drafted to fight in the war.
C) Women were perceived to be good workers after they were employed during World War I.
D) Women preferred to work as volunteers rather than paid workers.