Zn(s)+Cu 2+ (aq) Zn 2+ (aq)+Cu(s) In this reaction , copper ___ electrons, therefore it is the ___ agent.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.