Answer: A. Holocaust
Explanation: The Holocaust was a criminal plan that was put into action, and it meant the systematic imprisonment and killing of minority groups that the Nazis considered to be an impure lower race. This was according to the Nazis, primarily Jewish but also other nations, for example Gypsies, as well as members of sexual minorities, and in addition Hitler had a disdainful attitude towards the Slavs, the Poles, because he considered that the parts of some mythological Germany were in the territory of Poland.