Given three acid-base indicators - methyl prance ( end point at pH 4 ) bromthymol blue ( end point at pH 7) , and phenolphthalein ( end point at pH 9) select a suitable indicator for the following titrations .
A. Sodium formate (NaCHO2) with HNO3
B. hypochlorous acid with barium hydroxide
C. Nitric acid with HI
D.hydrochloric acid with ammonia