The energy change in an endothermic reaction is internal. Hence, option A is correct.
Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
A reaction or process in which heat is transferred to a system from its surroundings is endothermic.
The first law of thermodynamics states that the energy of the universe is constant.
The change in the internal energy of a system is the sum of the heat transferred and the work done.
Hence, option A is correct.
Learn more about the endothermic reaction here:
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