Environmental

Carbon monoxide (CO) in a residential property is most commonly produced by:

APaint containing lead
BImproperly vented gas appliances, furnaces, and fireplaces✓ Correct
CRadon gas decay
DAsbestos insulation

Explanation

Carbon monoxide is an odorless, colorless gas produced by incomplete combustion from gas appliances, furnaces, water heaters, fireplaces, and attached garages.

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