The correct answer is D) Declared that "seperate but equal" facilities for based on race are inherently unconstitutional.
The Brown vs. Board of Education case effectively overturned the "seperate but equal" doctrine established with the Plessy vs. Ferguson case. Lawyer Thurgood Marshall helped to win this case for the Brown family arguing that seperate facilities for black and white students was a clear violation of the 14th amendment. Specifically, he argued that this was a clear violation of the "Equal Protection Clause." This was the beginning of the end for segregated facilities within the US.