AP Environmental Science

Answer: B - Concentric circle is the city model in which development occurs surrounding a single commercial center.

Key Takeaway: In the concentric circle model, the business or major commercial district occupies the core region in the center of the city. In this area, there are more businesses than residents. The city then grows outward in rings of more residential areas and suburbs. Usually, in the concentric circle model, most people who live in the suburbs work in the central business district. The prime example of a concentric circle city is New York City.