Final answer:
The best-supported statement by the data in the map is option B, which states that northern cities offered better jobs for African Americans than southern areas did during the specified period.
Step-by-step explanation:
The best-supported statement by the data in the map is option B, which states that during the specified period, northern cities offered better jobs for African Americans than southern areas did.
The Great Migration of African Americans from the South to the North and West between 1910 and 1925 led to an increase in African Americans living in post-industrial cities in the North and the Midwest.
In these urban centers, greater educational opportunities, more expansive personal freedoms, and job opportunities attracted African Americans, making option B the best-supported statement by the data in the map.