What occurs when a fuel is burned?

When a fuel is burned, a chemical reaction called combustion occurs. During this process, the chemical potential energy stored in the fuel is converted into thermal energy, which is the heat released during burning. This thermal energy can be harnessed for various applications, such as heating, cooking, or generating electricity.

The combustion process produces heat and light, indicating that energy has been transformed from one form to another. Therefore, the correct response highlights that combustion primarily results in the release of thermal energy. This outcome is central to our understanding of how fuels can be utilized to perform work and provide energy in various forms.

Other options illustrate different aspects of energy but do not accurately represent the key outcome of burning fuel in the combustion process. For instance, while potential energy is involved, the emphasis on the release of thermal energy is crucial to understanding the impact of burning fuel.