500.0 ml of 0.160 M NaOH is added to 595 ml of 0.250 M weak acid (Ka = 1.69 x 10-5 M). What is the pH of the resulting buffer? HA(aq) OH-(aq) -> H2O(l) A-(aq)

a) pH = 3.72
b) pH = 9.28
c) pH = 4.56
d) pH = 10.12