What changes did city planners make when designing suburbs? a. city planners built homes closer together, using multipurpose zoning to have homes and shops side by side. b. city planners made sky scrapers multipurpose spaces for living, working, and shopping. c. city planners constructed buildings and planned streets around walking and creating a pedestrian-friendly environment. d. city planners created buildings and planned streets around cars instead of walking.

When city planners were designing suburbs, they created buildings and planned streets around cars instead of walking (D).

Because suburbs were outside the city where most people worked, the people living in suburbs had to use cars more than the people that lived in the city. Everything from shops and restaurants tended to be farther away from people living in the suburbs than it would have been in the city, so city planners planned the streets around cars instead of walking.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

answer; through play and social interaction;