African Americans who moved north
A. usually returned to the South within three years.
B. were looking for economic opportunity.
C. avoided working in so-called sick industries.
D. were safe from violence and discrimination.

B

Explanation:

They went to the North in order to avoid violence, discrimination and slavery; and also look for jobs. Basically they wanted a better life. They weren't technically safe from violence and discrimination, it was still there- but they wanted to avoid it.

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