In the Titration of 50

In the titration of 50.0 mL of a 0.100 M HCl solution with 0.100 M NaOH, what is the pH of the solution after the addition of 20.0 mL of the NaOH solution?

A) 1.00
B) 1.22
C) 1.15
D) 1.37
E) 12.63