A \(25.0\text{ mL}\) sample of a \(0.10\text{ M}\) solution of a weak monoprotic acid, \(\text{HA}\) (\(K_a = 1.0 \times 10^{-5}\)), is represented in the diagram above, where each \(\text{HA}\) particle represents \(0.000625\text{ mol}\) of acid. Water molecules and the autoionization of water are omitted for clarity. The sample is titrated with \(0.10\text{ M } \text{NaOH(aq)}\).

Which of the following particulate diagrams best represents the major species present in the reaction flask after \(37.5\text{ mL}\) of \(0.10\text{ M } \text{NaOH(aq)}\) has been added?