Why did the nazis target several groups for persecution?

a: the nazis considered the groups to be inferior.
b: the nazis felt the groups should speak german.
c: the nazis disliked groups from rural regions.
d: the nazis believed the groups contained refugees.

  A: The Nazis considered the groups to be inferior.

Explanation:  Germany's Nazi policy of conquest and creation of the Third Reich, also implied a kind of criminal experiment. Namely, according to their idea, it was necessary to create an empire based on the example of the ancient Empires, Roman, for example, and in that empire there were places only for superior races, while the inferior were to be exterminated. Thus, in the death camps, they were forced to work and killed, first of all Jews, but also other nations.

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because the vietnam war was fought in an especially brutal and untraditional way