The statement indicates an endothermic chemical reaction is "Decrease in temperature".
Endothermic reactions generate products by absorbing heat energy from the environment.
The temperature of the reaction mixture rises as energy is released in an exothermic process. The temperature drops when energy is absorbed in an endothermic reaction. A thermometer can be used to monitor temperature changes in the reaction mixture.
An endothermic reaction happens when the temperature of an isolated system drops while the temperature of its surroundings rises. The overall heat of reaction in endothermic reactions is positive (q > 0).
Hence the correct option is A.
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