Environmental

Radon is a concern in some Alaska properties primarily because:

AIt is a visible mold that grows in cold climates
BIt is a colorless, odorless radioactive gas that can accumulate in tightly sealed buildings and cause lung cancer✓ Correct
CIt contaminates drinking water from surface runoff
DIt is produced by heating oil combustion

Explanation

Radon is a naturally occurring radioactive gas that seeps from soil and rock. It can accumulate in tightly constructed buildings — a concern in Alaska where buildings are sealed for energy efficiency — and is the second leading cause of lung cancer.

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