Which One of the Following Would Make the Best Buffer

Multiple Choice

Which one of the following would make the best buffer? (Ac = acetate)

A) a solution of hydrochloric acid and sodium chloride, HCl and NaCl
B) a solution of acetic acid and ammonia, NaAc and NH₃
C) a solution of acetic acid and ammonium chloride, HAc and NH₄Cl
D) a solution of sodium acetate and ammonium chloride, NaAc and NH₄Cl
E) a solution of ammonia and ammonium chloride, NH₃ and NH₄Cl