The reaction A + B ? C + D is an example of- Select one: a. Zero order reaction b. First-order reaction c. Second-order reaction d. Fourth-order reaction The rate constant of the reaction: Select one: a. Depends on the concentration of reactants b. Describes the rate of the reaction when it reaches equilibrium c. Is a thermodynamic constant d. Will be different for an enzyme-catalyzed versus un-catalyzed reaction e. Both C and D are correct.