16. What did the Supreme Court case of Plessy v. Ferguson do in the U.S.?

A. It upheld sexist laws in the U.S. that prevented women from holding office
B. It granted women the right to vote
C. It ended the "separate but equal" legal doctrine
D. It upheld racist segregation laws in the US as "separate but equal," which became the law of the
land

D. It upheld racist segregation laws in the US as "separate but equal," which became the law of the land