Raphael Lemkin...
Pressured the United Nations in later years to make the offense of genocide illegal.
Was especially interested in the trial of the man who shot Talaat Pasha, one of the perpetrators of the Armenian massacre. He wanted to know why the perpetrators of the Armenian massacre were not held accountable for their crimes, while the assassin was.
All of these answers are correct.
When Lemkin first tried to define "genocide" in the 1920s and 1930s, he included social groups as well as genocides done for political motives.