Question

Hydrogen peroxide(H2O2) can be decomposed into water(H2O) and oxygen(O2) with the use of a catalyst.
2 H2O2 --(catalyst)--> 2 H2O + O2
Which of these will most likely increase the rate of the reaction?
A. Increasing the H2O2 concentration
B. Increasing the pressure of the oxygen
C. Decreasing the catalyst reaction
D. Decreasing the temperature of the H2O2

I believe it's A, but I'm not sure.