Environmental

Carbon monoxide is a hazard in Pennsylvania homes primarily produced by:

ARadon gas escaping from soil
BMalfunctioning fossil fuel appliances (furnaces, water heaters, fireplaces, attached garages)✓ Correct
CAsbestos insulation in older homes
DLead paint on walls in homes built before 1978

Explanation

Carbon monoxide (CO) is produced by incomplete combustion of fossil fuels. Malfunctioning gas furnaces, oil heaters, gas water heaters, fireplaces, generators, and vehicle exhaust in attached garages are primary sources.

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