Environmental
Carbon monoxide (CO) in homes is most commonly produced by:
ALead paint deterioration
BMalfunctioning combustion appliances such as furnaces, water heaters, and gas stoves✓ Correct
CMold and mildew growth
DTermite activity
Explanation
Carbon monoxide is a colorless, odorless gas produced by incomplete combustion. Malfunctioning gas appliances, fireplaces, and attached garages are common sources in homes.
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