Question: For the reaction aA+ bB ? rR, which of the following is true?

Options

A : frac{-r_A}{a}=frac{-r_B}{b} ? frac{r_R}{r}

B : frac{-r_A}{a} ?frac{-r_B}{b} ? frac{r_R}{r}

C : frac{-r_A}{a}=frac{-r_B}{b} ? frac{r_R}{r}

D : frac{-r_A}{a}?frac{-r_B}{b} ? frac{r_R}{r}

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