Environmental

Radon is a naturally occurring radioactive gas that enters homes primarily through:

AContaminated water from municipal systems
BCracks and openings in foundations from the soil✓ Correct
CBuilding materials imported from other countries
DOutdoor air pollution from industrial sources

Explanation

Radon is a naturally occurring radioactive gas produced by uranium decay in soil and rock. It typically enters buildings through cracks, gaps, and openings in foundations and is the second leading cause of lung cancer in the US.

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