$A$ weak monoacidic base is $1.2 \%$ dissociated in its $0.2 \ M$ solution. What is the value of dissociation constant?
- A$1.21 \times 10^{-5}$
- B$1.44 \times 10^{-5}$
- C$2.54 \times 10^{-5}$
- D$2.88 \times 10^{-5}$
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