The Seleucids, Parthians, and Sasanids were different ethnic groups but they all shared one attibute that allowed them to continue strong imperial rule. What was it?

AThey founded new cities to serve as administrative capitals
BThey continued Darius' administrative policies
CThey had few neighbors with imperial ambitions
DThey used Persian administrators as satraps

Verified Answer :

The Seleucids, Parthians, and Sasanids were different ethnic groups but the one attribute that allowed them to continue strong imperial rule was that "b. They continued Darius' administrative policies," since these policies were widely popular and successful.