Which of the following factors influence the rate of chemical reactions?

The correct options are
A. Nature of reactants
B. Temperature
C. Catalyst

The factors that influence the rate of chemical reactions are:

1) Nature of reactants: Powdered materials react more vigorously than solid materials. Moreover, reactivity increases if a material is in a liquid or gaseous state.

2) Temperature: Temperature increases the kinetic energy of molecules and thus the rate of reaction increases.

3) Catalyst: Catalysts do not take part in a reaction directly but increase the rate of a reaction.
(Note - Pressure will affect the rate of reaction if the reactants are in gaseous form.)