How did the Allies react when they discovered the Nazi concentration camps?

They negotiated with Hitler to end the mass killings at the camps.

They initiated immediate air raids to destroy the camps.

They sent in spies to infiltrate the camps.

They denounced and criticized the camps.

It's the last one

Explanation: They didn't negotiate with Hitler and they didn't immediately do stuff also there were no spies sent

The correct answer is D) They denounced and criticized the camps.

The Allies reacted when they discovered the Nazi concentration camps in the following way: They denounced and criticized the camps.

Indeed, when Allied troops found the concentration camps built by the Nazi Party, following the orders of Adolph Hitler, they were horrified for what they saw there. They did not expect to find the number of dead prisoners in the gas chambers. There were crops everywhere. When the world knew about the concentration camps and the persecution of Jews by the Nazis, people were in shock.