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Comprehensive and Detailed Explanation:

The correct answer is B, carbon monoxide.

Carbon monoxide (CO) is a colorless, odorless gas produced by incomplete combustion of fuels such as gasoline, diesel, wood, and natural gas. It is highly dangerous because it interferes with the blood’s ability to carry oxygen.

Exposure can lead to headaches, dizziness, confusion, loss of consciousness, and even death. Confined spaces such as tanks, pits, and enclosed rooms are particularly hazardous when combustion equipment is used or ventilation is poor.

OHST professionals are responsible for recognizing confined space hazards and ensuring proper monitoring and ventilation. Gas detection equipment is often used to identify oxygen deficiency and toxic gas buildup.

Industrial hygiene practices focus on preventing exposure through engineering controls, monitoring, and safe entry procedures. Understanding gas hazards is critical for preventing fatal workplace incidents.