Environmental
Radon is a naturally occurring radioactive gas that enters homes primarily through:
AElectrical wiring
BCracks in foundations and floors from the underlying soil✓ Correct
CMunicipal water supply systems
DPaint manufactured before 1978
Explanation
Radon is a colorless, odorless radioactive gas produced by the decay of uranium in soil and rock. It enters buildings through cracks and openings in foundations and is the second leading cause of lung cancer.
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