Which is the best definition of activation energy? the energy required to end a chemical reaction the energy required to bind a substrate to an active site the energy required to form or break the bonds of reactant molecules the energy required to re-form bonds in product molecules

the energy required to form or break the bonds of reactant molecules

Option C,  the energy required to form or break the bonds of reactant molecules

Explanation:

Activation energy is the amount of energy that is required to convert the stable atom or molecule of atoms into a forms where they become chemically active. In a chemically activated stage,  the bond between two molecules/atoms is  either broken or formed. In other words, activation energy is the energy required to carry out a chemical reaction.