The primary reason for the differences shown in this chart is B.fewer educational opportunities in the North
This refers to the systematic discrimination that is aimed at a particular race where they are segregated and treated unfairly.
Hence, we can see that based on the given chart, there is the display of the free blacks and the total percentage of free blacks and this showed the fewer educational opportunities in the racist North.
Read more about racism here:
https://brainly.com/question/71548
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