Answer:
A. Sparta never joined the league and resented Athens power and treatment of allies.
B. When some city-states tried to withdraw, Athens used force to keep them under control.
Explanation: Athens began to use the League's funds for its own purposes. This led tothe Peloponnesian War; and very soon the Leaugue disappeared in 404 BC. The Spartans, on the other hand, tried to force the Athenians to give up the Delian League; Spartans were not enthusiastic about the membership and never joined it, detesting Athens's power.