Final answer:
The concentric zone model describes the spatial organization of a city into concentric circles or zones. Zone B in this model houses formerly wealthy homes split into cheap apartments for new immigrant populations.
Step-by-step explanation:
The concentric zone model is a model of urbanization that describes the spatial organization of a city into concentric circles or zones. In this model, Zone B is likely to house formerly wealthy homes split into cheap apartments for new immigrant populations; this zone also houses small manufacturers, pawn shops, and other marginal businesses. This zone represents the transition between the central business district and the working-class housing areas.