Which is the best explanation of why heat is releasesd wheb wood burns?

Heat is released when wood burns due to a chemical reaction called combustion. During this process, the cellulose and other organic compounds in the wood react with oxygen in the air, breaking down the molecular bonds and releasing energy in the form of heat and light. This exothermic reaction occurs as the wood's components are oxidized, producing carbon dioxide, water vapor, and other byproducts. The heat generated raises the temperature of the surrounding materials, continuing the combustion process.