Acetic acid dissociates to $1.20 \%$ in its $0.01 \ M$ solution. What is the value of its dissociation constant?
- A$2.20 \times 10^{-2}$
- B$1.60 \times 10^{-4}$
- C$1.44 \times 10^{-6}$
- D$2.40 \times 10^{-4}$
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