Question

______ in particular is extremely dangerous, as it is odorless and colorless and can build up to toxic levels very quickly in confined spaces.

○ a. carbon dioxide
○ b. carbon monoxide
○ c. ozone
○ d. oxides of nitrogen

Explanation:

Carbon monoxide (CO) is odorless, colorless, and toxic, especially in confined spaces as it can accumulate to dangerous levels. Carbon dioxide is less toxic in normal cases, ozone has a distinct smell, and oxides of nitrogen are not typically odorless/colorless in the context of quick toxic buildup in confined spaces like CO.

Answer:

b. Carbon monoxide