The first law of thermodynamics is a restatement of the conservation of energy. Hence, option (c) is correct.
According to the First Law of Thermodynamics, heat is a type of energy, and as a result, thermodynamic processes are governed by the idea of energy conservation. Heat energy cannot be created or destroyed, hence this means. But it can be moved from one place to another and changed into and out of various types of energy.
Hence, Energy conservation is reaffirmed in the first law of thermodynamics.
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