Environmental

Carbon monoxide detectors are important in homes because carbon monoxide is:

AA visible yellow gas easily detected without equipment
BA colorless, odorless, toxic gas produced by incomplete combustion✓ Correct
COnly produced outdoors by vehicle exhaust
DA naturally occurring outdoor gas that seeps into basements

Explanation

Carbon monoxide is a colorless, odorless, tasteless gas produced by incomplete combustion of fuels (gas, oil, wood). It is called the 'silent killer' because it cannot be detected without a CO detector.

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