Environmental

Carbon monoxide (CO) is a concern in homes primarily because:

AIt causes paint to peel and walls to crack
BIt is a colorless, odorless, poisonous gas produced by incomplete combustion of fuels✓ Correct
CIt causes allergic reactions similar to mold
DIt is only dangerous outdoors

Explanation

Carbon monoxide is a deadly colorless, odorless gas produced by the incomplete combustion of fuels in appliances like furnaces, fireplaces, and generators. CO detectors are recommended (and required by law in many jurisdictions) in homes with fuel-burning appliances.

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