A Chemical Reaction Has Been the Subject of Intense Study

A chemical reaction has been the subject of intense study, and a rate law, rate = k[A][B]², was developed which summarized the mechanistic findings. Which change to the system will not cause an increase in the rate constant under any circumstances?

A) raising the temperature by 25 degrees
B) adding a positive catalyst
C) tripling the concentration of A
D) doubling the concentration of B
E) lowering the temperature by 0.5 degrees