The Fluoride Ion, F-, Reacts with Water as a Weak $\degree$

The fluoride ion, F-, reacts with water as a weak base: F^-(aq) + H₂ O(l) ⇄ HF(aq) + OH^-(aq) , with K = 1.5 * 10^-11 at 25 $\degree$
C.If sodium fluoride were dissolved in water to make a 0.150 M solution, what would be the resulting concentration of OH^-?

A) 0.15 M
B) 1.5 * 10^-6 M
C) 1.1 * 10^-12 M
D) 5.8* 10^-7 M
E) 2.3 * 10^-12 M