In a first-order reaction,the concentration of the reactant decreases from $1.0 \, M$ to $0.25 \, M$ in $20 \, \text{minutes}$. What will be the rate constant of the reaction?
- A$10 \, \text{min}^{-1}$
- B$6.931 \, \text{min}^{-1}$
- C$0.6931 \, \text{min}^{-1}$
- D$0.06931 \, \text{min}^{-1}$
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