Answer
C) Doubling the concentration of c while keeping the concentration of A and B constant would hove the least impact on the rate of the reaction.
Work Step by Step
a) if the concentration of SA was doubled the rate would become 4 times.
b) if the concentration of B was doubled then the rate would become 2 times
C) if the concentration of C was doubled the ot would have no effect on the rate of the reaction as it is not present in the rate equation.
D) Increasing the temperature will increase the number of collisions in between the particles and thus increase the rate of the reaction.
E) A catalyst lowers the activation energy of a reaction and as a result would increase the rate of the reaction.
