Calculate the $[H_3O^+]$ concentration if the $pH$ of the solution is $4.25$.
- A$6.123 \times 10^{-5} \text{ M}$
- B$5.623 \times 10^{-5} \text{ M}$
- C$4.508 \times 10^{-5} \text{ M}$
- D$4.085 \times 10^{-5} \text{ M}$
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