plz help me

What was the main cause of the Peloponnesian War?


A.

The Spartans resented Athens' dominance over other city-states.


B.

The Peloponnesian people turned out to be even fiercer warriors than the Spartans, so they attacked.


C.

Sparta began building a navy and the Athenians responded.


D.

The other city-states decided to band together to defeat Sparta and Athens.