The PH of a Ba(OH)₂ Solution Is 10

The pH of a Ba(OH) ₂ solution is 10.00. What is the H⁺ ion concentration of this solution?

A) 4.0 × 10^{-11 M}
B) 1.6 × 10^{-10 M}
C) 1.3 × 10^{-5 M}
D) 1.0 × 10^{-10 M}
E) 10.00 M