Calculate the rate constant of the first order reaction if $80 \%$ of the reactant decomposes in $60 \ minutes$.
- A$2.68 \times 10^{-2} \ minute^{-1}$
- B$5.36 \times 10^{-2} \ minute^{-1}$
- C$1.34 \times 10^{-2} \ minute^{-1}$
- D$8.1 \times 10^{-2} \ minute^{-1}$
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