The accurate descriptions of the Delian League are:
- The purpose of the league was to keep Persia from conquering Greece.
- Athens used force to keep city-states from withdrawing from the league.
The other statements about Athens refusing to contribute and Sparta being the dominant city-state are incorrect. Athens was actually the leader and a major contributor in terms of resources, while Sparta was not involved in the Delian League as it had its own league, the Peloponnesian League.