After the Persian Wars, a Formal Defensive Alliance That Included

After the Persian Wars, a formal defensive alliance that included city-states in northern Greece, on the Aegean islands, and along the Ionian coast

A) spanned the Greek mainland as well, discouraging foreign powers from challenging Greek power and influence.
B) made all the city-states of the alliance wealthier than they had ever been before.
C) became the basis for the Athenian Empire, because Athens required the other member city-states to fund warships built and manned by Athenians.
D) adopted Athenian radical democracy, offering alliance members the benefit of Athenian law in addition to mutual protection.