What was the Supreme Court’s justification for overturning the separate-but-equal doctrine

a. The Supreme Court did not have all of the facts when it adopted the separate-but-equal doctrine.
b. The quality of life for African Americans in the South had deteriorated considerably since the adoption of the separate-but-equal doctrine.
c. The Supreme Court needed to step in because the South had been unwilling to segregate educational facilities as required by Plessy v. Ferguson.
d. Segregated schools stigmatize minority children and are inherently unequal.