What states that for any two bodies in thermal equilibrium, the ratios of emissive power to the absorptivity are equal?

What states that for any two bodies in thermal equilibrium, the ratios of emissive power to the absorptivity are equal?
 A. Kirchhoff’s radiation law
 B. Newton’s law of cooling
 C. Stefan-Boltzmann law
 D. Hess’s law
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Answer :

Kirchhoff’s radiation law
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