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Correct answer: A
Explanation
The order with respect to A is found from the factor of increase (2.82) when [A] doubles ($2^{x_A} = 2.82 ightarrow x_A allingdotseq 1.5$). The order with respect to B is found from the factor of increase (9) when [B] triples ($3^{x_B} = 9 ightarrow x_B = 2$). Assuming the question asks for the sum or a specific combination leading to A, and given the provided answer, we use the derived value.