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It was created first in 1933 to hold Political prisoners, Jews, and POWs later on. It involved some of the most ruthless Officers of the Wehrmacht faction called Der Waffen SS. The lasting significance was the amount of people who lost their lives in this concentration camps. The most well known man in the Holocaust history was the SS Officer, Doctor and Scientist Joseph Mangele who made ruthless experiments on twins and other kids.
Explanation:
I do not know the answer but I think it might be D. or A.

Tsar Alexander II initiated a series of importantreforms in Russia. During his reign, the country's rail and communication networks were improved, resulting in increased economic activity and the development of banking institutions.
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