A 50.0 mL sample of 0.120 M monoprotic weak acid HA (K_a = 1.0×10−6) is titrated with 0.120 M NaOH at 25 °C. Which of the following indicators is most appropriate for identifying the equivalence point?
a) Bromothymol blue (6.0–7.6)
b) Phenolphthalein (8.3–10.0)
c) Alizarin yellow R (10.1–12.0)
d) Methyl red (4.2–6.3)