Read the text from the Blood Protection Law."Marriages between Jewish people and citizens of German or related blood are forbidden.”–Law for the Protection of German Blood and German Honor, Article 1 the Nuremberg Laws

The law banned marriages between Jewish people and people considered German or related blood. This reflects the Nazi goal of enforcing racial separation and creating a country for people of German ancestry only, so B is correct. Preventing Jewish people from becoming German citizens was addressed by other parts of the Nuremberg Laws, not by this marriage ban itself.

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