Environmental

Radon is a naturally occurring radioactive gas that enters buildings through:

ARoof vents and attic spaces
BCracks and openings in foundations from the soil below✓ Correct
CMunicipal water supplies only
DExterior paint on older homes

Explanation

Radon is a colorless, odorless gas produced by the decay of uranium in soil and rock. It typically enters buildings through cracks, gaps, and openings in the foundation floor and walls.

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