The mass spectrum of nitromethane, CH3NO2 shows major peaks at m/z 61,46,30 (base peak) and 15. Which statement is inconsistent with these data?

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.