Glycolic Acid, Which Is a Monoprotic Acid and a Constituent

Glycolic acid, which is a monoprotic acid and a constituent in sugar cane, has a pK_a of 3.9. A 25.0 mL solution of glycolic acid is titrated to the stoichiometric point with 35.8 mL of 0.020 M sodium hydroxide solution. What is the pH of the resulting solution at the stoichiometric point?

A) 4.12
B) 9.88
C) 6.01
D) 7.98
E) Sufficient information is not provided to determine the pH.