After Peace Was Achieved with Persia, Why Did the Athenians

Multiple Choice

After peace was achieved with Persia, why did the Athenians continue collecting funds from the Delian League members?

A) It was necessary as a means to secure the northern border.
B) The army needed to be rebuilt with an administrative center at Athens.
C) It was necessary to prevent an invasion by Persia.
D) It was necessary to maintain Athens's navy and rebuild temples.