Why Do We Avoid Titrating Ammonia with Acetic Acid

Multiple Choice

Why do we avoid titrating ammonia with acetic acid?

A) The change in pH near the end point is not large enough to be accurately detected.
B) There is no known indicator which changes color at the right pH.
C) The reaction is too slow.
D) There is not enough difference between the ionization constants of ammonia and acetic acid.
E) Ammonia does not react with acetic acid.