The half-life for a zero order reaction having $0.02 \; M$ initial concentration of reactant is $100 \; s$. The rate constant (in $mol \; L^{-1} s^{-1}$) for the reaction is
- A$1.0 \times 10^{-2}$
- B$1.0 \times 10^{-4}$
- C$2.0 \times 10^{-4}$
- D$2.0 \times 10^{-3}$
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