Final answer:
Endothermic reactions use chemical energy, which is absorbed during the process of breaking and forming chemical bonds in a compound. The correct option is option a.
Step-by-step explanation:
An endothermic reaction is a chemical process that absorbs energy from its surroundings. This energy is typically in the form of heat, but since the question is asking about the form of energy used in an endothermic reaction, we can refer to chemical energy, as described in the references provided. In the context of an endothermic reaction, chemical energy is required as a reactant and is consumed during the process, leading to a net absorption of energy.
Using the information given, it is clear that endothermic reactions use (e) Chemical energy, which is evident from the example stating that energy is absorbed by the reaction, making it endothermic. Chemical energy results from the particular arrangement of atoms in a chemical compound, and during an endothermic reaction, this energy is absorbed when chemical bonds are broken and formed.