Environmental

Carbon monoxide is a dangerous gas because it is:

AHighly visible and easily detected by smell
BColorless, odorless, and potentially fatal even at low concentrations✓ Correct
CRadioactive and emits detectable radiation
DOnly dangerous outdoors in open areas

Explanation

Carbon monoxide is a colorless, odorless, tasteless gas produced by incomplete combustion. It can reach fatal concentrations without detection, making CO detectors essential in homes.

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