Answer:
The correct answer is D) the encouraged Greece to create a strong Navy
Step-by-step explanation:
He constantly made a strong argument for the fortification of the Athenian Navy during his lifetime, and in 483 BC he managed to convince the Athenians to build a fleet of 200 triremes; these proved indispensable in the conflict with Persia.
He is considered a hero of the Athenian (and indeed Greek) cause, one who was most instrumental to the victory of Greece over the Persian Threat.
Cheers!