Answer
Phenolphthalein is the most suitable indicator for this titration, because this indicator changes its color with pH values between 8.3 and 11, so it is the better choice.
Work Step by Step
Acetic acid is weak and $KOH$ is strong; therefore, the pH at the equivalence point of the titration will be basic $(pH > 7)$.
Analyzing the 3 given indicators on page 667, the one where the color changes in a basic solution is the most appropriate, so Phenolphthalein is the correct answer.
