Which of the following is a possible reason that urban sprawl is common even when it has a negative impact on the environment?

Extending a city outward can be more economical than building taller structures, which often require more expensive construction. This can make urban sprawl common even though it harms the environment. Choice A is incorrect because outward expansion generally spreads people out rather than making conditions more crowded, and choice C is incorrect because sprawl can increase pollution.

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