For the chemical reaction $A + 2B \to 3C$,which of the following expressions correctly represents the rate of reaction?
- A$-\frac{d[A]}{dt} = -\frac{1}{2} \frac{d[B]}{dt} = -\frac{1}{3} \frac{d[C]}{dt}$
- B$-\frac{d[A]}{dt} = -\frac{1}{2} \frac{d[B]}{dt} = \frac{1}{3} \frac{d[C]}{dt}$
- C$\frac{d[A]}{dt} = \frac{1}{2} \frac{d[B]}{dt} = \frac{1}{3} \frac{d[C]}{dt}$
- D$-\frac{d[A]}{dt} = 2 \frac{d[B]}{dt} = 3 \frac{d[C]}{dt}$
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