For the reaction A+B products , it is observed that : (1) On doubling the initial concentration of A only, the rate of reaction is also doubled and (2) On doubling the initial concentration of both A and B, there is a change by a factor of 8 in the rate of the reaction. The rate of this reaction is given by :

1. A. rate =k[A][B]
2. B. rate =k[A] 2[B]
3. C. rate =k[A][B] 2
4. D. rate =k[A] 2[B] 2

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