The Following Figure Illustrates the Action of a HF and F^-

Multiple Choice

The following figure illustrates the action of a HF and F^- buffer where the sizes of the boxes are proportional to the concentrations of HF and F^- in solution.According to this figure, what happens when H₃O⁺ is added to the HF/F^- buffer?

A) The pH decreases.
B) The pH increases.
C) The concentration of HF increases.
D) The concentration of F^- increases.
E) Nothing happens.