The statement that indicates the energy that must be absorbed to initiate in the reaction pathway is "A".
A reaction mechanism, also known as a reaction route, specifies the molecular processes that occur in a chemical reaction. It defines the series of reactions that must occur in order to create a desired result.
When the bonds in the reactant molecules are disrupted, more energy is absorbed than is released when new bonds are generated in the products.
The amount of free energy which must be necessarily added to get from the energy level of the reactant molecules to the energy level of the product is the activation energy for the forward reaction. In plenty of other respects, activation energy is the input amount of energy needed for a reaction to take place.
Many chemical processes, including essentially all biochemical processes, do not occur spontaneously and require an initial energy input (known as the activation energy) to begin. When studying both endergonic and exergonic reactions, activation energy must be taken into account.
Hence the correct answer is A.
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