Answer :
"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.
Which statement accurately describes the Battle of Marathon?
A. Athens fought alone against Darius's army and decisively defeated the Persians. B. The Athenian army was forced to retreat, after which Sparta surrendered. C. Darius defeated a combined Greek army and captured Athens and Sparta. D. Sparta and the other Greek city-states defeated the Persian army of Darius.