The first law of thermodynamics is only:

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(D) The first law of thermodynamics is a statement of the law of conservation of energy,which states that energy can neither be created nor destroyed,

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Both $(a)$ and $(b)$

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(D) The first law of thermodynamics is a statement of the law of conservation of energy,which states that energy can neither be created nor destroyed,only transformed from one form to another. In the context of nuclear reactions or mass-energy equivalence $(E = mc^2)$,it is also associated with the conservation of mass-energy. Therefore,option $(d)$ is the most appropriate choice in this context.

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