Which of the Following Occurred During the Period Including Both

Which of the following occurred during the period including both world wars that facilitated employment and social gains for African Americans?

A) entry into the military by African Americans to serve their country
B) dissolution of segregation in war factories to recruit more African Americans to work in them
C) migration of African Americans to northern cities to seek jobs in war factories
D) greater need for African Americans to work in agricultural production in the South