Environmental

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

AOld lead-based paint deterioration
BThe breakdown of uranium in soil and rock beneath the building✓ Correct
CAsbestos-containing insulation
DUnderground storage tanks

Explanation

Radon is a colorless, odorless radioactive gas produced by the natural decay of uranium in soil, rock, and water. It can accumulate to dangerous levels in buildings, particularly basements.

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