In Plessy v. Ferguson, the Supreme Court ruled that facilities that were "separate but equal" were permissible under the US Constitution.
This allowed the Jim Crow laws to develop wherein African Americans went to different schools, ate at different restaurants or in different sections, and were generally segregated from the population
The correct answer is Option A: because people of the world- including dissenters in Germany- has approved their cause.
Joesph Stalin justified the war of Soviet Union with Hitler's Germany because he believed that everyone was on his side. He believed the world had approved his cause to fight tyranny.
He also believed many Germans did not like Hitler and were also supportive of his cause.
We should not forget that the people of Soviet Union were already supporting Stalin.
Once a certain interpretation or precedent is set in the Supreme Court, the way the law is interpreted is based on that precedent.