I believe the answer is D, metropolis.
In my notes, King Hammurabi created the first metropolis is babylon.
Merriam Webster Dictionary: metropolis noun
me·trop·o·lis | \ mə-ˈträ-p(ə-)ləs \
Definition of metropolis
1: the chief or capital city of a country, state, or region
2: the city or state of origin of a colony (as of ancient Greece)
3a: a city regarded as a center of a specified activity