Final answer:
Brown v. Board of Education ruled that racial segregation in public schools violated the equal protection clause of the 14th Amendment, overturning the 'separate but equal' doctrine of Plessy v. Ferguson.
Step-by-step explanation:
The landmark U.S. Supreme Court case of Brown v. Board of Education of Topeka, Kansas in 1954 is a pivotal moment in the civil rights movement, challenging the doctrine of 'separate but equal' as established by the earlier case of Plessy v. Ferguson. The unanimous decision made by the Supreme Court found that racial segregation in public schools was a violation of the equal protection clause of the Fourteenth Amendment. This ruling marked a critical step in the legal battle against segregation, declaring that separate educational facilities are inherently unequal and thus, unconstitutional.
The correct answer to the student's question is that the Brown v. Board of Education ruling held that racial segregation in schools violated the equal protection clause of the 14th amendment.