In the reaction A + B C, doubling the concentration of A doubles the reaction rate and doubling the concentration of B doubles the reaction rate. Which statement best describes this reaction? A. It is a second-order reaction in A and a second-order reaction in B. B. It is a first-order reaction in A and a second-order reaction in B. C. It is a first-order reaction in A and a first-order reaction in B. D. It is a second-order reaction in A and a first-order reaction in B. E. It is a zero-order reaction with respect to both reactants.