Environmental

Carbon monoxide is dangerous because it is:

AHighly visible and easily detected
BColorless and odorless, making it undetectable without a detector✓ Correct
CFound only in older homes built before 1950
DAlways produced by mold growth

Explanation

Carbon monoxide is a colorless, odorless gas produced by incomplete combustion of fossil fuels; it is lethal in high concentrations and requires a CO detector for detection.

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