A buffer solution is prepared by mixing equimolar amounts of a weak acid, \(\text{HA}\), and its conjugate base, \(\text{A}^-\). The particulate diagram below represents a sample of this initial buffer solution containing exactly \(5\) molecules of \(\text{HA}\) and \(5\) ions of \(\text{A}^-\). A student adds a solution containing exactly \(2\) units of \(\text{H}_3\text{O}^+\) to this sample.

Which of the following particulate diagrams best represents the resulting mixture after the acid-base reaction goes to completion?