Which statements about the Delian League are true?
Choose all answers that are correct.
A. When some city-states tried to withdraw, Athens used force to keep them under control.
B. Sparta never joined the league and resented Athens’s power and treatment of allies.
C. The league failed to protect Greece from the Persians, and the city-states were conquered.
D. The purpose of the league was to keep Sparta from gaining too much power.
