The Following Question Refers to the Following System: a 1 $\times$

The following question refers to the following system: A 1.0-liter solution contains 0.25 M HF and 0.32 M NaF (K_a for HF is 7.2 $\times$ 10^-4) . If one adds 0.30 liters of 0.020 M KOH to the solution,what will be the change in pH?

A) 0.02
B) 3.27
C) 0.13
D) -0.11
E) -0.28