The religious practices that was most widely used in both ancient river civilizations and ancient Native American civilizations is Monotheism. Read below about monotheism.
What is monotheism?
Monotheism refers to the doctrine or belief that there is only one God. Monotheism is the belief that there is only one deity, an all-supreme being that is universally referred to as God.
Therefore, the correct answer is option A. Monotheism.
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