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This is the definition of a catalyst (F). The activated complex is the point when the reaction has reached the activation energy (everything is just together and not formed products yet). The reaction rate will not increase itself. An inhibitor will, of course, inhibit the reaction from taking place. The activation energy is the amount of energy required for the reaction to take place. Free energy determines how spontaneous the reaction will be. Also, take note that a catalyst does absolutely nothing to the equilibrium constant or nature of equilibrium, and the catalyst will not effect the heat or difference in potential energy (delta H). You may see these things asked later on. By definition, a catalyst provides an alternate method for the reaction so that it lowers the required activation energy and allows it to more easily take place.