The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.

Greek city-states had supported rebellions in the Persian Empire. This caused Darius to decide to attack Greece following which, the Persian wars started.

Option C

Explanation:

The fourth king of the Achaemenid Empire, Darius I, was angrier by the support that was offered by the Greek city-states of Eretria and Athens to the Persian cities of Ionia when they had rebelled against the throne of Darius I.

Following the rebellion, Darius I decided to invade Greece. That resulted in the series of war between Persia and the Greece which are known as Persian wars.

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