Which list correctly lists the gases detected by the detector?

Which list correctly lists the gases detected by the detector?

• A. Methane, Oxygen, and Nitrogen
• B. Methane, Carbon Monoxide, and Nitrogen
• C. Methane, Oxygen, and Carbon Monoxide
• D. Oxygen, Nitrogen, and Helium

Answer: (C)

Gas detectors in underground mining are designed to monitor the gases that pose the most immediate risks: methane for explosive potential, oxygen to ensure there is enough breathable air, and carbon monoxide as a toxic gas produced by fires and combustion. The list that includes methane, oxygen, and carbon monoxide directly covers those critical hazards, so it matches what a typical detector is built to sense. Lists that add gases like nitrogen or helium miss the key hazards the detector is meant to warn about, and one that omits any of the three essential gases would leave miners unprotected for that specific risk.

Gas detectors in underground mining are designed to monitor the gases that pose the most immediate risks: methane for explosive potential, oxygen to ensure there is enough breathable air, and carbon monoxide as a toxic gas produced by fires and combustion. The list that includes methane, oxygen, and carbon monoxide directly covers those critical hazards, so it matches what a typical detector is built to sense. Lists that add gases like nitrogen or helium miss the key hazards the detector is meant to warn about, and one that omits any of the three essential gases would leave miners unprotected for that specific risk.