In what is known as the great migration, large numbers of african americans moved from the rural south to northern cities, beginning in the early twentieth century. what motivated this large-scale movement?
a) the emancipation proclamation
b) the opportunity to serve in the military in world war i
c) job openings due to industrial growth in northern cities
d) competition for jobs from immigrants moving into southern states

The correct answer is C)     job openings due to industrial growth in northern cities

what is the other part to the question

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."