Beyond his role in leading the Israelites out of Egypt, what is a significant theological contribution attributed to Moses in the Old Testament?

A Establishing the concept of monotheism, rejecting all previous polytheistic beliefs. B Articulating the Law of Moses, which provided a framework for covenantal living and ethical standards for the Israelites. C Creating the sacrificial system as the primary means of atonement for sins. D Predicting the coming of a messianic king who would establish an everlasting kingdom.