The statement that best describes the beliefs of Zoroastrianism is:
Good and evil constantly struggle for control of the universe.
Zoroastrianism teaches that there is a duality in the universe, with the struggle between the forces of good (represented by Ahura Mazda) and evil (represented by Angra Mainyu) being central to its teachings. Additionally, Zoroastrianism emphasizes the importance of human agency in this struggle, as humans are believed to have a role in choosing between good and evil. The belief in one supreme god and his evil opposite is also a core aspect of the faith.