The correct answer is C) Great Migration.
Indeed, due to racial and social injustice; to segregation and lynchings, six million African-Americans abandoned the former Confederacy Southern States and went to settle in the northern states of the USA. Many of these internal migrants settle in the borough of Harlem in New York and were later joined by an influx of black immigrants from Caribbean nations. Many of the African-Americans who moved to Harlem were very educated and had artistic talents. They revolutionized African-Americans views on religion, literature, photography, fashion, graphic arts, painting and even cinema.