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

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

Carbon dioxide displaces ambient atmospheric oxygen. Prolonged human exposure to high concentrations rapidly induces asphyxiation, unconsciousness, and death due to cellular oxygen starvation, mandating complete evacuation and positive ventilation before re-entry.