Answer:
C
Step-by-step explanation:
Since WWI created a labor sortage on factories in the northern states, african americans were encouraged to migrate to the North to make up for the workforce that had been recruited to fight in the war. Moreover, the wages for factory workers were higher than those for the agricultural sector, and the attitude towards african americans in the north was much more tolerant than that of the southern states, so they were further encouraged to leave the South.