Involve titrating a 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH. The Ka of HF is 3.5 × 10⁻⁴. pKa = 3.46. Determine the pH of the solution after the addition of 200.0 mL of KOH.

A. 9.62
B. 7.00
C. 3.46
D. 10.54
E. 8.14