Which type of fire can you combat using water?

Water is effective for extinguishing Class A fires, which are fueled by ordinary combustibles such as wood, paper, textiles, and some plastics. When water is applied to these materials, it cools them down below their ignition temperature and helps smother the flames.

In contrast, Class B fires involve flammable liquids and gases, which can actually spread and become more dangerous when water is used, as water can cause these substances to float or disperse. Class C fires involve electrical equipment, where using water can pose the risk of electric shock. Lastly, Class D fires involve combustible metals; specific agents other than water are necessary to extinguish these types of fires effectively, as water may react adversely with these metals. Therefore, the use of water is appropriate specifically for Class A fires, making this the correct answer.