The United States Constitution is said to be a “living document“ in part because court interpretations change over time. What was the key aspect of Plessy v. Ferguson, A supreme court decision that was later overturned?

A: Non-citizens gain the right to vote in local elections under the 26th amendment

B: poll taxes were outlawed as a prerequisite for voting under the 24th amendment

C: The principle of separation of church and state was applied under the first amendment

D: The “separate but equal“ doctrine was applied to the fourth amendment