The mass murder of the Jews was carried out in Concentration camps. Thus option 1st is correct.
What was concentration Camps?
Concentration Camps were the camps of the isolation in which the people were kept in the isolation and were detained without any process of the law in order to give them punishment.
After the beginning of the World War II, many of the Jewish community people living in the German where detained and kept in the concentration camps.
Hundreds and thousands of the people died in the concentration camps. therefore, it can be concluded that mass murder of the Jews was carried out in Concentration camps. Therefore, Thus option 1st is correct.
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