The correct answer is B. Eugenics, so. Adolf Hitler used eugenics as an excuse to forcefully euthanize millions of people.
During the Nazi Germany in the middle of XX century the government implanted a lot of politics related to eugenics, because they considered that they were the real "Aryan race" this idea was based on their physical characteristics such as blue eyes, blond hair, snub nose, and clear skin, for that reason the person who did not look like this, was pursued, tortured, murdered or used in scientific tests. In this time, the Nazis had concentration camps where the people considered different was forced to work in bad conditions and finally they were euthanized in gas ovens.
