Sulfur dioxide is converted into sulfur trioxide in the Contact process. The conditions employed are $450^{\circ}\text{C}$ and $200\,\text{kPa}$ with a vanadium(V) oxide catalyst. Which row gives the description and explanation of the effect that changing the conditions has on the rate of reaction?
- Ano catalyst; lower; the activation energy is higher
- Bhigher pressure; higher; the particles have more kinetic energy
- Clower temperature; lower; the particles collide more frequently
- Dlower pressure; higher; there are more particles per unit volume