Class Alpha fires consist of what burning material?

Class Alpha fires are specifically associated with ordinary combustibles, and the most common materials involved in these types of fires include wood, paper, cloth, and certain types of plastics. The key factor making wood the correct answer is that these materials burn readily and are typically found in household and structural fires.

In contrast, the other options involve different classes of fire. Gasoline and oil would fall into Class B fires, which involve flammable liquids. Chemicals can encompass a wide range of substances and may belong to various fire classes depending on their properties, potentially involving Class D fires (combustible metals). Understanding the classifications of fires is paramount for effective firefighting strategies and ensuring safety protocols are appropriately followed.