The correct answer is C) racism and ethnic hatred.
Governments are most often motivated to eliminate a population because of the effects of racism and ethnic hatred.
In the history of humankind, the constant has been the war. Humans are conflictive beings that lover power and control. That is why through history we find pages of imperialistic invasions, wars, slavery, and control. Racism and ethnic hatred are one of the many reasons why humankind kills others and go to war. It is hard to believe what happened with the Nazi Party persecution of Jes during World War II, the Holocaust. Adolph Hitler considered the Germans a superior race and the Jews an inferior race.
WW1 had left the German economy in shambles because of the reparations they had to pay. The sudden surge in demand for supplies made thousands of jobs for the unemployed and boosted the GDP.