Samantha's urban community is blanketed with smog. Which statement best explains the reason for this poor air quality? People crowd sidewalks as they walk to shopping malls. People use underground subways

Samantha's urban community is blanketed with smog. Which statement best explains the reason for this poor air quality?

People crowd sidewalks as they walk to shopping malls.
People use underground subways for long-distance travel.
People ride bicycles to commute to work on a daily basis.
People drive cars whenever they need to go somewhere.

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