What was the major religion of the four Persian empire

The Persians followed a monotheistic religion called Zoroastrianism, which perceived just a solitary divinity named Ahura Mazda. In view of the lessons of the Persian prophet Zoroaster, this was the official religion of the Persian Empire, in spite of the fact that vanquished people groups were permitted to rehearse their own religions.

Explanation:

Zoroastrianism.

Explanation:

Persians followed Zoroastrianism, a monotheistic religion. It was based on the teachings of the prophet, Zoroaster, and it involves a single deity named Azhur Mazda. Hope that helps!

c is the correct answer for this question.