What is the concentration of $[H^+]$ in a solution with a $pH$ of $5.4$?
- A$3.98 \times 10^{-6} \ M$
- B$2.51 \times 10^{-5} \ M$
- C$1.00 \times 10^{-7} \ M$
- D$5.40 \times 10^{-1} \ M$
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