What can you conclude is the best describes is the best definition for the word intractable as it used in the sentence?

Not to sure what you are asking but

The definition of intractable is not easily controlled or hard to work. An example of intractable used as an adjective is an intractable clay which means clay that is difficult to shape.

Two distinct laws passed in Nazi Germany in September 1935 are known collectively as the Nuremberg Laws: the Reich Citizenship Law and the Law for the Protection of German Blood and German Honor. These laws embodied many of the racial theories underpinning Nazi ideology. They would provide the legal framework for the systematic persecution of Jews in Germany. Jews in Germany were not easy to identify by sight. Many had given up traditional practices and appearances and had integrated into the mainstream of society. Some no longer practiced Judaism and had even begun celebrating Christian holidays, especially Christmas, with their non-Jewish neighbors. Many more had married Christians or converted to Christianity. A supplementary decree published on November 14, the day the law went into force, defined who was and was not a Jew. The Nazis rejected the traditional view of Jews as members of a religious or cultural community. They claimed instead that Jews were a race defined by birth and by blood.