Correct answer choice is:
C. Thirty years
Explanation:
The war was a Hellenic war battled by the Delian League commanded by Athens against the peninsula League commanded by Sparta. The war was split into 3 major phases. Sparta had a victory in the battle of Tanagra throughout the first Peloponnese war with Athens. Sparta proclaimed that Athens has breached the thirty-year Peace and were the main cause of war. The explanation for the war was the Athenian management of the Delian League.
