Which of the following is NOT classified as a Class A fuel?

Class A fuels are typically defined as solid materials that are combustible and can be involved in ordinary combustibles fires. These include materials such as wood, paper, some plastics, and rubber. In this classification, Class A fuels are characterized as those that produce ash when burned.

Gasoline, while flammable and capable of being involved in fires, is classified as a Class B fuel because it is a liquid. Class B fuels consist of flammable liquids and gases, which behave differently from solid materials. Understanding the distinctions between fuel classifications is crucial for effective fire safety and emergency responses.

Therefore, gasoline is correctly identified as not being classified as a Class A fuel, as it does not fit the definition pertaining to solid combustibles and instead falls under the category of liquid fuels.