What was the Nazis' preferred method of executing as many Jews as quickly as possible in the concentration camps?

A. Poisoning their food

B. Starving them to death

C. Working them to death

D. Using gas chambers

I believe the answer is D, as they were able to put a large amount of the Jews into one area, and just gas it. B and C were both used, but generally took a long time. Gas chambers were by far the fastest and most effective way of executing the Jews.