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
  $2.0 \times 10^{-3}$