Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
- $\mathrm { pH } = - \log _ { 10 } \left[ \mathrm { H } ^ { + } \right]$ Find the $\mathrm { pH }$ if the $\left[ \mathrm { H } ^ { + } \right] = 3.9 \times 10 ^ { - 8 }$ .

A) $8.41$
B) $7.59$
C) $8.59$
D) $7.41$