COMMON LIT - THE GREAT MIGRATION by History. com2010

What is the central idea of the article?

A
After the Civil War, Blacks still didn't have the same rights as whites, but they fought really hard for their equality.
B
After the Civil War, Blacks continued to be mistreated, but there was nothing that they could do about it until the World Wars were fought and laws in America changed.
C
After the Civil War ended, Blacks gained a lot more freedom and opportunity that they had previously and many chose to move to the north because they were free to move where they chose.
D
After the Civil War ended, Blacks were still mistreated through white supremacist laws so they migrated to urban areas in the north where they also found they had to fight against lot of challenges.