All of the Following Was True About the Peloponnesian War

All of the following was true about the Peloponnesian War except

A) the foundation of Athenian strategy, initially, was the exploitation of its naval power.
B) the foundation of Spartan strategy was the exploitation of its strength in fighting face-to-face military confrontations on land.
C) a plague killed one-third of the population of Athens.
D) the ultimate result of the war was a unified Greece headed by the city by Thebes.
E) Athenians were defeated and their city wall torn down.