As presented in this chapter, if you add up all of the personal costs $($automobiles$),$ public costs $($streets$,$ maintenance, etc.$),$ and developer costs $($buildings$),$ which of the following environments is the least expensive?

a$.$ Environments designed primarily for automobiles where buildings are inexpensive, simple, and quick to build and where roads can be puilt without the added expense of sidewalks and bike lanes that just waste space.

b$.$ Hybrid environments like Georgetown in Washington, DC where people and automobiles share the space between rows of nice$-$but tot overly elaborate$$buildings$.$

c$.$ Car$-$free walking streets with expensive buildings.

d$.$ They are all roughly equal in cost$.$