Defentetly A. ~Crutchie
"Athens fought alone against Darius's army and decisively defeated the Persians" is by far the best option from the list. This major defeat started a new string of wars with Persia, however.
The correct answer is A: Athens fought alone against Darius's army and decisively defeated the Persians at the Battle of Marathon in 490 BCE. A small Athenian force, motivated to defend their democracy, managed to defeat a much larger Persian army. This victory was pivotal in the Greco-Persian Wars, demonstrating Greek military effectiveness and unity.
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