$A$ monobasic weak acid dissociates $2 \%$ in its $0.002 \ M$ solution. Calculate the dissociation constant of the weak acid.
- A$2 \times 10^{-9}$
- B$8 \times 10^{-7}$
- C$6 \times 10^{-7}$
- D$4 \times 10^{-6}$
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