Environmental

Radon is a naturally occurring radioactive gas that:

AIs easily detected by smell and sight
BEnters buildings through foundation cracks and is a leading cause of lung cancer✓ Correct
CIs found only in commercial properties
DIs eliminated by painting the basement

Explanation

Radon is a colorless, odorless radioactive gas that enters buildings through foundation cracks and soil. It is the second leading cause of lung cancer in the U.

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