Which type of fire extinguisher is suitable for A, B, and C class fires?

The Halon/BRX fire extinguisher is specifically designed to combat A, B, and C class fires, making it the suitable choice for the question. Fire classes are categorized as follows: Class A fires involve ordinary combustibles such as wood, paper, and cloth; Class B fires involve flammable liquids like gasoline, oils, and solvents; and Class C fires involve electrical equipment.

Halon is effective for these types of fires because it cools the flames and displaces the oxygen around it, inhibiting the chemical reaction that fuels combustion. This versatility allows it to be used safely on flammable liquids and electrical fires without risking additional hazards, such as electrical shock.

The other choices listed do not provide the same level of effectiveness across the A, B, and C classes. A water fire extinguisher, for example, is mainly effective on Class A fires and may create hazards when used on Class B or C fires due to the risk of spreading flammable liquids or conducting electricity. The portable oxygen bottles mentioned do not serve as extinguishing agents and are not suitable for fire suppression.