What happened after the Ionian revolt that led to the first battle of the Persian Wars?

After the Ionian revolt was put down, Persia launched an expedition against Athens and Eretria, which had supported the rebels. The Persian force landed at Marathon in 490 BCE, leading to the Battle of Marathon, the first major battle of the Persian Wars. Darius I ordered the campaign, although he did not personally lead the army there; choice B is the intended answer.

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