A Sample of Ammonia (Approximately 0

A sample of ammonia (approximately 0.10 M, K _b = 1.8×10 ^{- 5}) is titrated with 0.0993 M HCl. What indicator should be used?

A) methyl red (p K _In = 5.00)
B) bromthymol blue (p K _In = 7.30)
C) phenolphthalein (p K _In = 8.7)
D) thymol blue (p K _In = 9.20)
E) alizarin yellow R (p K _In = 10.2)