Environmental

A Mississippi homeowner suspects elevated levels of carbon monoxide (CO) in their home. Carbon monoxide is particularly dangerous because it:

AHas a strong, distinctive odor that is easy to detect
BIs colorless and odorless, making it undetectable without a CO detector, and can cause serious illness or death✓ Correct
CIs only dangerous outdoors near industrial facilities
DIs visible as a colored gas

Explanation

Carbon monoxide is colorless and odorless, making it impossible to detect without a CO detector. CO poisoning can cause headaches, dizziness, confusion, and death.

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