The correct option is A. Plessy v. Ferguson case, decided in 1896, legalized segregation by ruling that "separate but equal" laws did not violate the 14th Amendment, which guaranteed equal treatment under the law.
In 1896, the Plessy v. Ferguson decision uplifted the principle of racial segregation over the next half-century. Thus the legal justification for segregation on trains and buses and in public facilities is provided by the ruling authority.
Thus, the Plessy v. Ferguson case had the effect that reaffirming and strengthening Jim Crow laws in the south.
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