Which of the following factor(s) influence the rate of a chemical reaction?

The correct option is D Concentration of reactants

The factors that influence the rate of chemical reaction are:

• Surface area of reactants: Powdered materials react more vigorously than solid materials. Moreover, reactivity increases if a material is in liquid or gaseous state.
• Temperature: It increases the kinetic energy of molecules and thus the rate of reaction increases.
• Catalyst: It does not take part in a reaction directly but increases the rate of a reaction.
• Concentration of reactants: With the increase in the concentration of the reactants the rate of the reaction increases.