Correct items in the list:
A - precedent was set for future war trials.
C - A Jewish homeland, Israel, was created by the United Nations.
D - Many Nazi leaders were forced to stand trial for crimes against humanity.
E - Over six million Jews were executed or died in Nazi camps.
Genocides were not brought to an end. There have been other genocides after the Holocaust. An example would be the genocide that occurred in Rwanda in 1994. The genocide in Rwanda had arisen out of problems created by colonialism in that country. The Dutch colonial government had favored the Tutsi people over the Hutus. (The factor of leaders increasing tension between groups.) That created unequal distribution of power and resources. When the Dutch pulled out of the country, the postcolonial situation was one of great economic, political and social instability. All of this played into the violence by Hutus against Tutsis when the Hutus came into power in Rwanda.
Hitler was not executed. He killed himself on April 30, 1945, as the Soviet military was closing in on the chancellery in Berlin.