Answer:
A. African Americans moving from the farms in the South to jobs in Northern cities.
Explanation:
It was a name given to the relocation of more than 6 million African Americans from the rural South to the cities of the North from 1916 to 1970. Prior to 1910 90% of the African-American population lived in the South.
The Great Migration began due to unsatisfactory economic opportunities and severe segregation laws in the South. On the other hand, the industrialized cities of the North needed industrial workers.
I hope this answer helps you.