Which of the following best explains the role of a city under central place theory? ( 1 point )
A.) A city serves a function beyond its immediate area by performing services integral to the world economy.
B.) A city exists above a threshold and under a range of economic production as it provides for its surrounding market area.
C.) A city provides for a specific ranking of different central places depending on their size.
D.) A city marks the minimum provision needed for a central place to be economically reasonable in a given area.