Why Does Increasing the Concentration of Reactants Typically Increase the Rate

Multiple Choice

Why does increasing the concentration of reactants typically increase the rate of a reaction?

A) A higher concentration of reactants means a higher kinetic energy per molecule.
B) A higher concentration of reactants means a lower activation energy.
C) A higher concentration of reactants means that a catalyst has been added.
D) A higher concentration of reactants means a higher activation energy.
E) A higher concentration of reactants means more collisions per amount of time.