The correct answer is A) Athens.
The dependence of the sea was a characteristic of Athens.
Athens economy depended on two factors: trade and farming. Regarding trade, the use to navigate the sea in order to transport their products to other regions and fortify its trade relations. In the case of Sparta, its economy heavily depended on agriculture. Sparta had a more powerful army. Indeed they were excellent Warriors and military service was an obligation for the Spartans men but did not have a great navy. Athens had not a great army but had the navy for defensive purposes.