What Is the POH of a Solution If Its $\left[ \mathrm { OH } ^ { - } \right]$

Multiple Choice

What is the pOH of a solution if its $\left[ \mathrm { OH } ^ { - } \right]$ concentration is $6.2 \times 10 ^ { - 3 }$ ?

A) 8.8
B) 7.3
C) 2.2
D) 4.6
E) 5.8