Which of the Following Statements About the Seleucid Empire Is

Which of the following statements about the Seleucid Empire is correct?

A) The Hellenic population was confined to the capital city of Kandahar.
B) Greek invaders maintained a separate residence and identity from the local population.
C) The Greek population established institutions familiar to them from the polis.
D) The Greek populations quickly adopted the local languages and abandoned the use of the Greek language.