Answer:
B. the Supreme Court's decision in Plessy V. Ferguson
Explanation:
The "Separate but equal doctrine" is what it was called, This is what the NAACP main concern was because this law stated that it is alright to segregate black people from white schools as long as black schools are of the same quality as white schools. This is really what sprang them into action to sue the state of Kansas. due to the fact Oliver Brown's child had to go to a black school when they lived right next to a white school and the black school was of less quality.
