Answer: Option (A) is the correct answer.
Step-by-step explanation:
A reaction that brings changes in chemical composition of a substance is known as a chemical reaction.
When energy is absorbed in a chemical reaction then it is known as an endothermic reaction. Whereas when energy is released in a chemical reaction then it is known as an exothermic reaction.
Therefore, we can conclude that the statement some chemical reactions release energy, and other chemical reactions absorb energy, is true.