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 upheld racial segregation, overturning the decision in plessy. b. the brown decision clarified the decision in plessy, explaining that the law requires that segregated facilities be equal. c. the brown decision was the opposite of the plessy decision and end segregation. d. the brown decision built on the plessy decision by desegregating additional public places.