Darius Believed That a Preemptive Strike Against Athens and Eretria

Darius believed that a preemptive strike against Athens and Eretria was necessary because:

A) Athens was planning to launch a military campaign against Persia.
B) Eretria,aided by Athens,had instituted a government unfavorable to the Persians.
C) Athens and Eretria had executed Persian citizens who were residing in their poleis.
D) Greek poleis in Asia Minor could always revolt against Persia when they could look for support in this endeavor from Athens,Eretria,and other Greek poleis.
E) Athens,aided by Eretria,had instituted a government unfavorable to the Persians.