$A$ weak monobasic acid is $2 \%$ dissociated in its $0.1 \ M$ solution. What is its dissociation constant?
- A$4.0 \times 10^{-5}$
- B$1.0 \times 10^{-5}$
- C$2.0 \times 10^{-5}$
- D$2.5 \times 10^{-5}$
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