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# The lightening of fire files is :

$(A)\;\text{Slow combustion of luceferin in air} \\ (B)\;\text{chemiluminescence } \\(C)\;\text{Cold light phenomenon } \\(D)\;\text{All of these}$

The phenomenon in which a chemical change (here oxidation luciferin protein ) gives out light energy is called chemiluminescence.
Hence d is the correct answer.