Is carbon dioxide combustible?

Carbon dioxide is classified as non-combustible. This means that it does not support combustion and cannot ignite or burn under normal conditions. In fact, carbon dioxide is often used as a fire extinguisher because it displaces oxygen and helps to suppress flames.

In contrast, combustible materials are those that can burn in the presence of an ignition source and oxygen. Since carbon dioxide does not meet these criteria and instead suffocates flames by depriving them of oxygen, identifying it as non-combustible is accurate.

The other options introduce conditions where one might think combustion could occur, but they are misleading because carbon dioxide, by its inherent chemical properties, does not participate in combustion processes.