An engineer is trying to create a fast reaction in a fuel mixture. which should she do? a. decrease the amount of fuel b. lower the temperature of the engine c. add a catalyst to the fuel mixture d. lower k for the fuel reaction

To increase the rate of a reaction, you can either do any of the following:
-increase the temperature
-increase concentration of the aqueous reactant
-increase pressure of the gas
-use a catalyst
-increase surface area of the solid reactant

From these, the engineer should therefore do C. Adding a catalyst speeds up the reaction without really joining the reaction.