What caused the decline in the Zoroastrian population in Persia? A: An epidemic broke out in Persia, which resulted in large-scale deaths among Zoroastrians. B: The invasion of Persia by Islamic rulers forced the local Zoroastrians to convert to Islam. C: A natural disaster struck Persia and caused a decline in Zoroastrian numbers. D: King Vishtaspa implemented humiliating laws on local Zoroastrians, forcing them to convert to Islam to avoid ill treatment.

D

Explanation:

Over time, the persecution of Zoroastrians became more common and widespread, and the number of believers decreased by force significantly. Most were forced to convert due to the systematic abuse and discrimination inflicted upon them by followers of Islam.

The invasion of Persia by Islamic rulers forced the local Zoroastrians to convert to Islam

Explanation:

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explanation:

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