The Supreme Court's Decision in Brown V

The Supreme Court's decision in Brown v. Board of Education of Topeka is most notable for which of the following reasons?

A) It sparked the immediate desegregation of public facilities across the South.
B) It was completely ignored by the executive and legislative branches.
C) It struck down the separate but equal doctrine established by Plessy v. Ferguson.
D) It marked the Supreme Court's first acceptance of the Tenth Amendment.