Rate constant of a first order reaction when the reactant falls to a quarter in a given time

1. A.
   $1.6021\ \text{min}^{-1}$
2. B.
   $0.2303\ \text{min}^{-1}$
3. C.
   $0.4031\ \text{min}^{-1}$
4. D.
   $0.06020\ \text{min}^{-1}$

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1. A.
   $0.0021\ \mathrm{s^{-1}}$
2. B.
   $0.0050\ \mathrm{s^{-1}}$
3. C.
   $0.003\ \mathrm{s^{-1}}$
4. D.
   $0.006\ \mathrm{s^{-1}}$

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