The victory in the Persian Wars was so important for Athens as It gave Athens the opportunity to expand and take control of Persia Option(d) was correct.
The attack, comprising of two particular missions, was requested by the Persian ruler Darius the Great principally to rebuff the city-territories of Athens and Eretria.
The Greeks were, at last, triumphant and their development safeguarded. In the event that they had been crushed, the western world might not have acquired from them such enduring social commitments as a vote based system, traditional design and figure, theater, and the Olympic Games.
Therefore Option(d) is correct.
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