Answer: Option (a) is the correct answer.
Step-by-step explanation:
Activation energy is defined as the minimum amount of energy required to initiate a chemical reaction.
So, when a chemical reaction is unable to reach towards its activation energy then the reaction will not proceed further.
As a result, the chemical bonds will not change until they reach the activation energy. This means that chemical reaction will only proceed further when reactants cross the activation energy path.
Thus, we can conclude that if a chemical reaction does not reach its activation energy, then the chemical bonds will remain unchanged.