What is the source of basic moral laws that jews must obey?

The answer is: The Torah, or Pentateuch.

Explanation:

For many years both Jews and Christians accepted the traditional idea that Moses was the writer of the Torah, or Pentateuch, under the direct inspiration and mandate of Yahweh or Jehovah.

The main feature of the Jewish faith is the belief in an omniscient, omnipotent and provident God, who would have created the universe and chosen the Jewish people to reveal to him the law contained in the Ten Commandments and the ritual prescriptions of the third and fourth books of the Torah.

The answer is: The Torah, or Pentateuch.

where are the choices

answer; internal; covert processes;