What are the main products of combustion?

The primary products of combustion are heat and light, which result from the chemical reactions occurring during the burning process. When organic materials combust, they produce smoke, which contains unburned particulates and various combustion byproducts. Fire gases are also a significant category, representing a mix of gases released during combustion, which includes but is not limited to carbon dioxide, carbon monoxide, and other volatile compounds.

This choice accurately encompasses the key outputs of the combustion process and highlights the byproducts one would expect to encounter in a fire scenario. Smoke and fire gases are particularly critical in firefighting and understanding fire behavior, as they pose hazards in terms of visibility and inhalation risks for firefighters and occupants alike.

While other options mention certain aspects of combustion, they do not fully encapsulate the significance of smoke and fire gases, which have practical implications for safety and firefighting strategies.