The correct answer is A) As a Supreme Court justice, he said that segregation in schools was against the Constitution.
Earl Warren was one of the several judges that ruled on the Brown vs. Board of Education case. This was one of the most important Supreme Court cases in history, as it overturned the previous Supreme Court case Plessy vs. Ferguson. Warren and the other justices ruled that the doctrine of "separate but equal" was a clear violation of the 14th amendment, specifically the Equal Protection Clause.
