For a reaction $\frac{1}{2} A \rightarrow 2 B$,the rate of disappearance of $A$ is related to the rate of appearance of $B$ by the expression:
- A$\frac{-d[A]}{dt} = 4 \frac{d[B]}{dt}$
- B$\frac{-d[A]}{dt} = \frac{1}{4} \frac{d[B]}{dt}$
- C$\frac{-d[A]}{dt} = \frac{1}{2} \frac{d[B]}{dt}$
- D$\frac{-d[A]}{dt} = \frac{d[B]}{dt}$
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