What is the correct acid-conjugate base pair for the following equilibrium? H₂O (l) + HPO₄²⁻ (aq) ⇌ H₂PO₄⁻ (aq) + OH⁻ (aq).
A) H₂O (l) and OH⁻ (aq)
B) HPO₄²⁻ (aq) and H₂PO₄⁻ (aq)
C) H₂O (l) and HPO₄²⁻ (aq)
D) HPO₄²⁻ (aq) and OH⁻ (aq)
E) H₂PO₄⁻ (aq) and OH⁻ (aq)