Calculate $[H_3O^{+}]$ of a monobasic acid if it is $0.04 \%$ dissociated in $0.05 \ M$ solution.
- A$1 \times 10^{-5}$
- B$1.5 \times 10^{-5}$
- C$2.0 \times 10^{-5}$
- D$3.0 \times 10^{-5}$
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