One way that municipal zoning has led to the unavailability of affordable housing in many cities is... Select one: a. Too many areas are zoned for commercial and industrial purposes. People should be able to live near polluting industries if they want to. b. Many areas of cities and towns are zoned for upper income housing only. Setting aside municipal zones for McMansions leaves much fewer areas zoned for middle class housing. c. Certain areas are still zoned for "whites only". This segregated zoning forces non-white and lower-income residents to live in smaller areas of the city. This drives rents up due to high demand and low supply. d. Large areas of many cities are zoned for single family detached housing. This precludes duplexes and triplexes, which would potentially double or triple the housing units on the same area of land