This depends on if a refers to the current government.
If it is, then the answer is D. none of the above
However, the articles of confederation, america's first government, was the first thing that Americans did after the war, so the answer could also be A
Ooh I know this one!
Josef Mengele was an infamous Nazi doctor and he presided over the Auschwitz arrivals.
The answer is a. The Civil Rights Act of 1968.