One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is __________.

Correct Answer: Option D — prolonged exposure to high concentrations of CO2 gas causes suffocation

Carbon dioxide is an asphyxiant that displaces oxygen. In enclosed spaces, high concentrations of CO2 pose a severe risk of suffocation to personnel. Safety protocols require strict accounting of all crew members and thorough ventilation before re-entry following the discharge of a fixed CO2 fire extinguishing system.