For a first-order reaction,the rate constant is $4 \times 10^{-3} \, s^{-1}$. If the concentration of the reactant is $0.02 \, M$,what will be the rate of the reaction?
- A$8 \times 10^{-5} \, M \, s^{-1}$
- B$4 \times 10^{-3} \, M \, s^{-1}$
- C$2 \times 10^{-2} \, M \, s^{-1}$
- D$4 \times 10^{-5} \, M \, s^{-1}$
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