The Option D is true because in Plessy v. Ferguson (1896) the supreme court ruled that "separate but equal" facilities were constitutional. The court held for a separate car act.
Separate Car Act ensured that the nonwhites and whites are to be given separate but equal tickets in order to use public facilities.
It stopped states from creating segregation laws, and It also limited the rights of African American citizens.
Thus, option D is true that the Supreme court ruled that "separate but equal" facilities were constitutional.
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