A Solution with a POH of 4 $\times$ 10^-9 M $\times$ 10^-4 M

A solution with a pOH of 4.3 has a [H⁺] of ________

A) 6.8 $\times$ 10^-9 M.
B) 3.2 $\times$ 10^-4 M.
C) 4.8 $\times$ 10^-5 M.
D) 2.0 $\times$ 10^-10 M.
E) 4.3 M.