Environmental

Carbon monoxide (CO) is a hazard in homes because it:

AIs easily detected by smell and color
BIs a colorless, odorless gas that can cause death without warning✓ Correct
CIs primarily found in older homes with lead paint
DIs only produced by industrial facilities, not residential appliances

Explanation

Carbon monoxide is a colorless, odorless, tasteless gas produced by incomplete combustion. It is undetectable without a CO detector and can cause unconsciousness and death. Pennsylvania requires CO detectors in certain residential occupancies.

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