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# One Einstein = N $\times$ quanta of energy where N is :

$(A)\;\text{Boltzmann constant } \\ (B)\;\text{Reynold number} \\(C)\;\text{Avogadro number} \\(D)\;\text{Lambert - Beer constant}$

N is Avogadro no Einstein is energy absorbed by N molecular and each absorbs only one quantum or photon.
Hence C is the correct answer.