34. The rate expression for a particular reaction is rate = k[A][B]2. If the initial concentration of B is increased from 0.1 M to 0.3 M, the initial rate will increase by which of the following factors?
(A) 2
(B) 6
(C) 12
(D) 9

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統計： A(6), B(3), C(3), D(8), E(0) #347721