Brown v. Board of Education overturned the US Supreme Court case:
B. Plessy v. Ferguson
Explanation:
1. Plessy v. Ferguson was a landmark case in 1896 that upheld the constitutionality of racial segregation under the "separate but equal" doctrine.
2. Brown v. Board of Education, in 1954, declared that segregation in public schools was unconstitutional, overturning the Plessy v. Ferguson decision.
Therefore, the correct answer is B. Plessy v. Ferguson.
