The correct answer is - crimes against humanity.
Both, the Cambodians and the Turks, made genocides that were in the most brutal way, and they were a prime example of crimes against humanity. Innocent people were killed because of the twisted, sick ideologies of the leaders of the two countries, were even babies were brutally murdered. While the genocide under the leadership of Pol Pot in Cambodia, is accepted throughout the world as one of the worst actions against humanity, the genocide that was committed by the Turks over the Armenians is still kind of in the background, and is not even mentioned, like it never happened, even though it was a genocide that was more devastating to the Armenian population than the loss the Jews had when there was a genocide over them by the Nazis.