Which of the Following Refers to a Suburb

Which of the following refers to a suburb?

A) a large city that is a significant economic, political, and cultural center for the region
B) the local level of government below the county used primarily in 20 northeastern states
C) a local level of government within counties that are usually organized around population centers
D) a residential area, typically within commuting distance of a city
E) the largest jurisdiction within a state