How did the dissenting opinion in Plessy v. Ferguson help the NAACP Legal Defense Fund build an argument to eventually dismantle racial segregation?

The dissenting opinion in Plessy v. Ferguson helped the NAACP Legal Defense Fund build an argument to eventually dismantle racial segregation because it argued that
a) separate facilities were inherently unequal
b) segregation was necessary for social order
c) racial segregation was constitutional
d) the government had the right to enforce segregationiscriminate on the basis of race