New businesses grew along route 66 and included all of the following except

a. gas stations

b. auto mechanics' shops

c. automotive and spare parts stores

d. factories

The correct answer should be D. factories

In the time when Route 66 started getting used, cars were still relatively new and they broke down all the time. This enabled for car shops and spare part stores to thrive because people would stop and repair their cars, as well as get gas. Manufacturing was not common because nobody actually lived on the route, it was a way to travel, not a place to live.