Hydrogen Chloride Is Added to a Buffer Solution of Ammonia

Hydrogen chloride is added to a buffer solution of ammonia, N , and ammonium chloride, N ⁺Cl⁻. What is the effect on the concentration of ammonia? What is the effect on the concentration of ammonium chloride?

A) HCl reacts with both the ammonia and ammonium chloride, so the concentration of both decreases.
B) HCl reacts with only the ammonium chloride, so the concentration of the ammonium chloride decreases and the concentration of ammonia increases.
C) HCl reacts with both the ammonia and ammonium chloride, so the concentration of both increases.
D) HCl reacts with only the ammonia, so the concentration of the ammonium chloride increases and the concentration of ammonia decreases.