In a first order reaction,the concentration of reactant decreases from $800 \ mol/dm^3$ to $50 \ mol/dm^3$ in $2 \times 10^2 \ s$. The rate constant of the reaction in $s^{-1}$ is:
- A$2 \times 10^4$
- B$3.45 \times 10^{-5}$
- C$1.386 \times 10^{-2}$
- D$2 \times 10^{-4}$
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