Which city state compared with empires

a city state does not have an emperor  

the difference between a city-state and an empire is that a city-state dose not have a emperor

- "bill clinton ( the 42nd u.s. president, served in office from by low unemployment, declining crime rates and a budget surplus. during clinton's second term, the u.s. economy was healthy, unemployment was low and the nation experienced a major technology boom and the rise of the internet."

answer; ///i do believe that the correct answer is (b) ///middle colony