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# Zone Refining is based on process of

$(a)\;\text{Distillation} \\(b)\;\text{Fractional Distillation} \\(c)\;\text{Fractional Crystallisation} \\ (d)\;\text{Froath floatation.}$

The metal is crystallized from their mixture with impurities having almost similar solubilities.
Hence c is the correct answer.