Did the Persians engage in syncretism?

Did the Persians engage in syncretism?
 
  A) The Persians engaged in syncretism by allowing the conquered peoples to continue to worship their own deities and carry on their own cultural traditions without persecution. Often, the conquered people did adopt, in some form, the religious practices of their rulers.
  B) The Persians did not engage in syncretism, as they forced both their religious practices and cultural traditions upon the conquered peoples.
  C) The Persians engaged in syncretism, as they allowed the people they conquered to self govern without interference.
  D) The Persians did not engage in syncretism, as they instituted a widespread policy of destruction of the conquered peoples, their temples, and traditions.
  E) Syncretism was not practiced in the ancient world.