Which class of fire requires specific extinguishing agents like CO2?

The correct answer pertains to Class B fires, which involve flammable liquids and gases, such as gasoline, oil, and solvents. CO2 (carbon dioxide) is an effective extinguishing agent for these types of fires because it displaces oxygen in the air, effectively smothering the flames. Additionally, CO2 is non-conductive, making it safe for use on electrical fires as well, which can also be categorized under Class B if they involve flammable liquids.

Understanding the characteristics of Class B fires also helps clarify the other options. Class A fires involve ordinary combustibles like wood or paper and are typically extinguished with water or foam. Class C fires involve energized electrical equipment and require methods that do not conduct electricity, often utilizing CO2 or a dry chemical, but CO2 is not exclusively linked to Class C. Class D fires involve combustible metals, such as magnesium or sodium, and require specific extinguishing agents that are tailored for metal fires, rather than CO2.

Thus, the use of CO2 is specifically and effectively aligned with the properties of Class B fires, confirming the answer's validity.