Which of the following indicators would be the best to use when 0.050 M benzoic acid (Ka = 6.6 *10^-5) is titrated with .05 M NaOH?
A) bromphenol blue, pH range: 3.0-4.5
B) bromcresol green, pH range: 3.8-5.4
C) alizarin, pH range: 5.7-7.2
D) phenol red, pH range: 6.9- 8.2