The correct answer is C.
In her speech, the German chancellor Angela Merkel evidences the existence of the genocide perpetrated by the nazis, when she states that the camps (as she referred to Buchenwald and also other concentration and extermination camps) were not places for living, but places for dying.
The nazis used their camp system to systematically exterminate the Jewish population using gas chambers and crematories, and putting in practice what the nazis denominated Final Solution to the Jewish Question. Also political defectors and enemies, and other human groups that German nazis considered could contaminate the superior German Aryan race, were killed in the camps: disabled, gypsys, homosexuals, communists...