Answer:
a. produced a feeling of Jewish separation from those who were not Jewish.
Step-by-step explanation:
The belief that there is only one God by the Jew produced a feeling of separation of the Jewish people from those who were not Jewish.
Option B is wrong because the Jews do not believe in Osiris but rather on Jehovah.
Option C is wrong because the religion of the Jews was accessible by all Jews and not by the prophets alone.
Option D is wrong because the Jews practice Judaism and not Christianity