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.

Explanation:

This poor air quality is due to the excessive use of engine-based transportation like cars. Each person use a single car which emits carbon dioxide, so if there are 1 million of people, would be 1 million of cars emitting this polluting gas, causing the smog.

On the other hand, there are several ways to avoid this, like using subways, bicycles or just walking, all these activities don't contaminate the air, and they will drastically decrease air pollution. The problem nowadays is that people don't want to walk or put any effort to go out, they just want to sit behind the wheel and let the car do all the job, but this way, we aren't gonna have clean air anymore.

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