Which of the Following Chemical Equations Is an Acid-Base Reaction $\to$

Which of the following chemical equations is an acid-base reaction?

A) Ba(OH) ₂(aq) + K₂SO₄(aq) $\to$ BaSO₄(s) + 2 KOH(aq)
B) 3 NaOH(aq) + AlCl₃(aq) $\to$ Al(OH) ₃(s) + 3 NaCl(aq)
C) 2 H⁺(aq) + Zn(s) $\to$ H₂(g) + Zn²⁺(aq)
D) 2 HCl(aq) + Pb(NO₃) ₂(aq) $\to$ PbCl₂(s) + 2 HNO₃(aq)
E) H₃PO₄(aq) + NH₃(aq) $\to$ NH₄⁺(aq) + H₂PO₄^-(aq)