Final answer:
It is true that both the concentric zone and sector models believe cities expand from a central core. Zone B in the concentric zone model generally contains previously affluent homes that have been subdivided into economical apartments.
Step-by-step explanation:
It is true that both the concentric zone and sector models assume cities grow and develop outward from a single core. The concentric zone model visualizes the city as a series of concentric circular areas emanating from the city's center, while the sector model presents the city as composed of wedge-shaped zones extending outward from the central business district along transportation routes.
In the concentric zone model, Zone B is likely to house c. Formerly wealthy homes split into cheap apartments. This zone is right outside the central business district and tends to be a transitional area where older, more opulent homes are divided into affordable living spaces for new immigrants and supports small manufacturers and businesses that cater to these populations.