What must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic? A)Atoms are rearranged.

B)Chemical bonds are formed.

C)Energy is released in the form of heat.

D)Energy is absorbed in the form of heat.

An exothermic reaction creates heat.

The answer would be c) energy is released in the form of heat.

A chemical  reaction is classified as exothermic or endothermic based on the direction of heat flow during the reaction

The correct option for what must occur for a reaction to be classified as an exothermic reaction is option C

C) Energy is released in the form of heat

The reasons the above value is correct are;

An exothermic reaction is one in which energy in the form of light, heat or other forms because the sum of the energy in the product is less than the sum of energy contained in the reactants

Therefore, for a chemical reaction to be specifically classified as an endothermic reaction, instead of an exothermic reaction, is energy, in the form of heat (or light) must be released

The correct option is option C

Learn more about exothermic reaction here:

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a polar bond is formed when electrons are shared unevenly between atoms