Which of the following is not a class of fire?

In fire classification, various classes are used to categorize the types of materials that burn and the appropriate extinguishing methods for those fires. Class A, for example, includes ordinary combustibles like wood, paper, and textiles. Class B involves flammable liquids and gases, while Class C is associated with fires that involve electrical equipment.

However, there is no recognized Class E in standard fire classifications. The classes may vary slightly based on different fire safety organizations and regulations, but the commonly accepted classes in the context provided do not include Class E. Therefore, identifying Class E as not being a legitimate class of fire is correct, as it does not align with the established fire classification system.