Which of the Following Refers to a Metropolis

Which of the following refers to a metropolis?

A) a large city or municipality that serves as an economic and cultural center for a region
B) a larger area generally consisting of suburbs and other smaller cities
C) the largest local level of government below the state, currently used in 48 states
D) a community on the fringe or an urban area, defined by relatively high levels of commuting to the urban area, low housing density, and high population growth
E) a local level of government within counties that are usually organized around population centers