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Final answer:c) Activation energy is essential to initiate a chemical reaction, providing the energy needed to break reactant bonds and overcome the activation barrier, leading to the reaction's progress.Explanation:In order for a reaction to occur, activation energy must be overcome. Activation energy is the energy required to start a chemical reaction, and it's necessary for breaking the bonds in the reactants. This initial energy input can come from various sources, such as heat, light, or other forms of energy transfer. Once the reaction overcomes this barrier, it can either release energy (exothermic reaction) or absorb energy (endothermic reaction). So, the correct answer to the question is c) Activation....