Which of the following is a firing device used in wildland firefighting?

A drip torch is a common firing device used in wildland firefighting. It is designed to ignite fuels in a controlled manner, allowing firefighters to create an intentional fire that can help manage or direct wildfires. The drip torch has a fuel reservoir and a wick or nozzle that facilitates the ignition of a flammable liquid, usually a mixture of diesel and gasoline.

Using a drip torch allows firefighters to establish backburns or burn out sections of vegetation to create fire breaks, which can stop or slow the spread of an uncontrolled wildfire. This tactical use of fire is an important strategy in wildland firefighting, making the drip torch a critical tool in a firefighter's arsenal.

Other tools listed, such as fire hoses and water pumps, are primarily used for extinguishing fires and not for starting them, while a flare gun is typically used for signaling rather than as a tactical firing device.