Which apparatus is commonly used in structure firefighting?

Fire engines are specifically designed for structure firefighting, making them the appropriate choice in this context. They are equipped with firefighting pumps, hoses, water tanks, and various tools essential for combating fires in buildings. The design of fire engines allows for rapid response and deployment, enabling firefighters to quickly access water and suppress flames, which is crucial for saving lives and protecting property during structure fires.

Other options, while important in their own right, do not serve the primary purpose of directly fighting fires in structures. Ambulances focus on medical emergencies and patient transport, hazardous materials trucks are equipped for dealing with chemical spills and toxic substances, and rescue boats are primarily utilized in water rescue situations. Therefore, fire engines are distinctly suited for the challenges associated with structure firefighting.