The area of the united states thst was most affected by brown v. board of education was
the south
the rural north and south
the urban north and south
the north

Most likely it would be the South because that is where

segregation has the most support but even in urban areas in both the north and south have been schools practicing segregation. 

They may have a different reason for doing so but some schools in

Northern states like Boston had segregation as well.  Eventually this system was abolished due to

the efforts of the federal government as well as civil rights movement that  enabled Blacks as well as other minorities the same chances as whites.

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The South was most affected by the United States court case of Brown versus the Board of Education