The Delian League was created to

Aconduct democratic reforms in Athens.
Bdiscourage further Persian invasions.
Cmaintain peace within the Greek world.
Dbring greater wealth to Sparta and its allies.
EAll these answers are correct.

Verified Answer :

The Delian League was created to for "all of these reasons," since it became clear that a larger amount of organization was needed in order to keep the individual city states prosperous. 

"all of these reasons,"