Environmental

Radon is a hazardous gas in real estate that enters homes primarily through:

AOld lead pipes in the water supply
BCracks in foundations and floors from the soil✓ Correct
CAsbestos-containing ceiling tiles
DFormaldehyde in manufactured wood products

Explanation

Radon is a naturally occurring radioactive gas that enters homes through cracks in foundations and floors, gaps around service pipes, and other openings from the soil below.

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