Though Both the Neo-Assyrian Empire and the Persian Empire Asserted

Though both the Neo-Assyrian Empire and the Persian Empire asserted military power to forge their empires, what was an important difference between them?

A) The Persians did not have to control a multiethnic population.
B) The Persians' ancestors were farmers, not pastoralists.
C) The Persians used infantry exclusively in their army.
D) The Persians asserted imperial power based on persuasion and appeal to common benefit.