How did the majority of supreme court justices in the case of plessy versus ferguson interpret the fourth amendment

Hello!

The correct answer is A. Racial segregation is constitutional if the facilities are the same for everyone.

Plessy vs. Ferguson ruled the "separate but equal" doctrine, which determined that racial segregation in schools was constitutional as long as the schools were the same for all races. This was later ruled as unconstitutional by the Brown vs. Board of Education court case. 

I hope this helps you! Have a great day!
-Mal