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How did the Supreme Court's decision in Brown v. Board of Education relate to its earlier decision in Plessy v. Ferguson?

A. The Brown decision built on a Plessy decision, ruling that public education is as important a right as transportation

B. The Brown decision reinforced the Plessy decision, showing that the Reconstruction Amendments were a success

C. The Brown decision contradicted the Plessy decision, holding that separate but equal treatment was not really equal

D. The Brown decision clarified the Plessy decision, stating that racial segregation was damaging to children but not to adults