Answer: The right answer is the B) "Push factors in African-American migration to the North and West, 1865-1900."
Explanation: Deciding between options B and C can be challenging. Options A and D should be discarded because The Ten-Percent Plan was about readmitting Southern states into the Union, and the notes about the migration are all positive and they are not reflecting on the effects of migration on Southern culture or society. Pull factors are those that attract people to migrate to a certain area, region or country, whether push factors are those that impel people to leave a certain area, region or country and migrate to another. It seems at first that the notes in the list are referring to the factors that attracted African-Americans to the North and West, but I would contend that ultimately and implicitly they are all stressing that migration was the result of unfavorable and comparably worse living conditions in the South (worse housing and living conditions, less personal freedom and privileges, worse job opportunities and lower wages).