In an acid-base titration experiment, 50.00 mL of a 0.0500 M solution of acetic acid (ka=1.75 x 10^-5) was titrated with a 0.0500 M solution of NaOH at 25 degree C. The system will acquire this pH after addition of 40.00 mL of the titrant: a) 2.45 b) 3.27 c) 4.58 d) 5.36