Final answer:
Ernest Burgess came up with the concentric zone theory in 1925. The theory views a city as a series of concentric circular areas with different categories of people and businesses.
Step-by-step explanation:
The concentric zone theory was developed by Ernest Burgess in 1925. It is a model that views a city as a series of concentric circular areas, expanding outward from the center of the city. Each zone represents a different category of people and businesses that invade and repurpose the areas they have invaded. Zone A is the center of the business and cultural district, while Zone B is composed of formerly wealthy homes split into cheap apartments for new immigrant populations. Zone C consists of the homes of the working class and established ethnic enclaves, Zone D holds wealthy homes and white-collar workers, and Zone E contains the estates of the upper class and the suburbs.