At a reunion of Holocaust survivors, representatives among them are chosen to speak about the conditions of their respective camp. Simon Srebnik explains how he was just 15 years old when he was sent to a camp outside of the city of Lodz. The camp where he had been sent was the first killing center the Nazis had set up in Poland, and few prisoners made it out alive. That is why, he says, he is the only one there to speak about it. In which camp was Simon MOST likely imprisoned?
A. Treblinka II
B. Chelmno
C. Belzec
D. Sobibor