Calculate the rate constant of a first-order reaction $A \rightarrow B$ having a rate of $5.4 \times 10^{-6} \text{ mol dm}^{-3} \text{ s}^{-1}$ and concentration $[A] = 0.3 \text{ M}$.
- A$1.8 \times 10^{-5} \text{ s}^{-1}$
- B$1.8 \times 10^{-4} \text{ s}^{-1}$
- C$2.5 \times 10^{-5} \text{ s}^{-1}$
- D$3.2 \times 10^{-4} \text{ s}^{-1}$
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