Respuesta :
The correct answer is A) Labor shortages created by World War I.
During World War I, factory jobs opened up in urban cities like New York. This was due to the military draft which resulted in thousands of men being sent overseas to fight in World War I. These men left behind jobs that needed to be filled in order to meet the demands of wartime production. This resulted in an increase in the amount of African American citizens employeed in factories during this time.