How did the persians build a strong empire

Per the question in your picture:

C-Athens had defeated Persia at the Battle of Salamis, so Persia supported Sparta.

Explanation:

The Peloponnesian Wars were between Athens and Sparta (Greek).  Persia supported Sparta because Athens had defeated Persian so they became allies with Sparta.

How did the persians build a strong empire?  By using a common currency

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give brainlest

originally he was supposed to be dead but they wanted to continue the series so they brought him back to life.