The correct reason behind the increased rate of the reaction with the increase in these parameters is the increased collisions between the particles.
Option C.
Molecules that take part in a chemical reaction are present in a common medium. This medium contains all the molecules and the enzymes required for the reaction. The reaction that takes place in the medium is initiated by the collision between the reactant molecules which dispose into the reaction. Thus, increasing the rate of collision between the molecules increases the rate of the reaction.
Increasing the temperature increases the kinetic energy of the molecules which in turn increases the rate of collision.
Increase in the pressure reduces the volume, thereby bringing the molecules together, increasing collision.
Increase in concentration increases the number of molecules per unit volume, thereby increasing the rate of collision.
