What was the ruling of the supreme court on the court case " plessy v. ferguson " ? question 4 options: a)the separate car act was unconstitutional based on the 14th amendment b)the separate car act was constitutional only in southern states c)laws that segregated blacks and whites in public places did not violate the constitution as long as the facilities were separate but equal d)the separate car act was unconstitutional based on the 13 th amendment