Which of the following is an example of a fine fuel?

Fine fuels are materials that ignite easily and burn quickly due to their small size and low moisture content. Grass is a prime example of fine fuel because it typically has a high surface area-to-volume ratio and dries out rapidly, allowing it to catch fire with minimal heat input. In addition, grass can spread fire quickly across the landscape, particularly in dry conditions.

While roots, branches, and sticks may also contribute to fire behavior, they do not fall into the category of fine fuels. Roots are generally underground and less accessible for combustion, while branches and sticks are larger, typically containing more moisture and therefore requiring a greater heat source to ignite. These characteristics make grass notably more susceptible to ignition and combustion, illustrating why it is classified as fine fuel.