Belzec, Sobibor, & Treblinka were all . A: located in Germany B: concentration camps C: extermination camps D: liberated by the United States

The answer is option (C) extermination camps.

Explanation:

Belzec is located in Poland precisely South West of Belzec's railway station in Belzec village. It was used as an extermination camp (killing centre) for the murder of Jews by Nazi Germany. 

Sobibor is also located in Poland. Like Belzec, it was a death camp near a village called Sobibor. It was used by Nazi Germany to enslave, torture and kill Jews by gassing operation during the Holocaust. 

Likewise, Treblinka is located in Poland. Treblinka was a killing centre in the village of Treblinka. Like the other two camps already mentioned, Treblinka was built by Germans when they occupied Poland during World War II. Nazi Germany murdered thousands of Jews in the camp by gassing them. 

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Explanation: Hope you understand