The correct answer is A) Brown v. Board of Education.
The landmark Supreme Court Case that finally overturned the ruling in Plessy v. Ferguson was the Brown v. Board of Education.
In the case of Plessy v. Ferguson, the Supreme Court had ruled the constitutionality of "separate but equal." But many years later this decision was reversed by another Supreme Court resolution in the case Brown v. Board of Education of Topeka, Kansas decided on May 17. 1954. The judges decided that "separate but equal" regarding public school facilities violated the Equal Protection established in the 14th Amendment to the US Constitution.
