Which of the following will lower the activation energy for a reaction?

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Activation energy is the energy barrier that must be overcome for a reaction to proceed. A catalyst provides an alternative pathway with a lower energy barrier, often by stabilizing the transition state or forming an intermediate that makes it easier for reactants to convert to products. This speeds up the reaction without changing the overall energy difference between reactants and products or the equilibrium position. Increasing temperature, while it raises the fraction of molecules with enough energy to cross the original barrier, does not actually lower the barrier itself. Increasing reactant concentration increases how often molecules collide, not the energy required to react. An inhibitor makes reactions harder by blocking sites or removing reactants, not easier. So adding a suitable catalyst best lowers the activation energy.