Supported by the New Urbanists’ belief that having subdivisions containing homes of similar price implies de facto economic segregation. For example, let’s say one neighborhood has one-million-dollar houses. Another neighborhood has $300,000 houses. Why would this imply economic segregation? Because, the New Urbanists think, people who can afford one-million-dollar houses will buy one-million-dollar houses. They wouldn’t buy the $300,000 houses. This is the assumption (A) describes.

We have no reason to think New Urbanists think zoning laws often make neighborhoods more diverse. If anything, New Urbanists think zoning laws often make suburbs more economically uniform.

P2 describes feelings of hostility from automobile drivers toward other automobile drivers. It doesn’t mention feelings of non-drivers toward drivers.

P2 doesn’t indicate the New Urbanists’ beliefs about suburban residents’ awareness of health benefits.

P2 doesn’t indicate the New Urbanists’ beliefs about people’s preferences for similar-looking houses. Although suburbs usually contain houses that are identical in appearance, this doesn’t imply anything regarding people’s preferences about living in similar-looking houses.