Problem: An increase in the temperature of the reactants causes an increase in the rate of reaction. The best explanation for this behavior is that as the temperature increases: A. the concentration of reactants increases B the activation energy decreases.  C. the collision frequency increases.  D. the fraction of collisions with total kinetic energy > E a increases.  E. the activation energy increases. 

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An increase in the temperature of the reactants causes an increase in the rate of reaction. The best explanation for this behavior is that as the temperature increases:

A. the concentration of reactants increases

B the activation energy decreases. 

C. the collision frequency increases. 

D. the fraction of collisions with total kinetic energy > E a increases. 

E. the activation energy increases.