Environmental

Carbon monoxide (CO) in homes is most commonly produced by:

AOld lead paint deterioration
BIncomplete combustion in gas appliances, furnaces, or attached garages✓ Correct
CRadon decay in the basement
DAsbestos insulation

Explanation

CO is produced by incomplete combustion in gas furnaces, water heaters, stoves, and car exhaust in attached garages. It is odorless and colorless, making detectors essential.

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