A substance cannot catch fire or burn as long as its temperature is lower than:

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Critical temperature

Melting point

Boiling point

Ignition temperature

answer is D.

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Detailed Solution

A substance cannot catch fire or burn as long as its temperature is lower than the ignition temperature.
As long as a substance's temperature is below its ignition temperature, it cannot burn or catch fire. A few examples of combustible materials include paper, fabric, wood, kerosene, gasoline, and fuel gas. Non-combustible materials are those that do not burn when ignited or exposed to flames. Water and sand are the two most common non-combustible substances.

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