What is a safety concern when using carbon tetrachloride or a CO2 type fire extinguisher?

The concern regarding the use of a CO2 type fire extinguisher relates primarily to the generation of harmful gases in closed areas. When carbon dioxide is released, it can displace oxygen in the atmosphere, which poses a significant risk to individuals in enclosed spaces where adequate ventilation is lacking. Lower levels of oxygen can lead to asphyxiation and other serious health hazards for anyone present. Therefore, understanding the environment in which a CO2 extinguisher is being used is crucial to ensuring the safety of all individuals nearby. In contrast, the other options may not accurately reflect the specific hazards associated with carbon tetrachloride or CO2 extinguishers in particular.