What is the combination of elements necessary for complete combustion?

Complete combustion occurs when fuel reacts with oxygen in a manner that allows for the maximum release of energy. The necessary combination of elements for this process includes oxygen, heat, and fuel. The inclusion of a self-sustaining reaction is also crucial; it refers to the chain reaction that keeps combustion going once it has started, allowing the process to continue until the fuel or oxygen is depleted.

Oxygen is required as the oxidizing agent, heat initiates the combustion process, and fuel serves as the source of energy. The self-sustaining aspect is significant because it indicates that once combustion initiates, the energy produced can sustain the reaction without needing additional external heat.

In contrast, other options either include elements that do not contribute to complete combustion or misrepresent the necessary conditions. For example, carbon dioxide and water are products of combustion rather than components required to initiate it, and nitrogen does not play a role in the combustion reaction itself. Thus, the correct answer identifies the essential components that work together to achieve complete combustion effectively.