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By giving them the opportunity to become rich and work.<span />
A would be the answer to this
I'm pretty sure it was the Auschwitz, wait no I know it's that place. Auschwitz is the most well known and largest of all the concentration camps. It's main purpose was for killing Jewish people. It's believed they killed over 1.1 million people IN JUST Auschwitz...They're were plenty more concentration camps that killed people though.
(Here's a picture of it today...)