During the Nazi regime in Germany, Jews were forced to wear yellow stars on their cloth to classify themselves from non-Jew people. The star is known as Star of David, two triangles in the shape of the six-pointed. The Nazis restore this practice as part of their oppression during the Holocaust. Nazi adopted the policy of forcing Jews to wear yellow star badges for isolating and dehumanizing them in Europe, marking them as being inferior to everyone else.
The League of Nations was formed to unify many countries. It wasn't very efficient. The United Nations was essentially an improved version of the League of Nations.
It would be that "d. They refused to baptize native converts into the Christian faith", since the Spanish viewed this as a way of solidifying their efforts of religious conversion.