Identify which among the chemical equations is an acid-base reaction.

• A. 2 H₊(aq) + Fe(s) → H₂(g) + Fe₂₊(aq)
• B. 2 HBr(aq) + Ag(NO₃)₂(aq) → PbBr₂(s) + 2 HNO₃(aq)
• C. H₂SO₄(aq) + NH₃(aq) → NH₄⁺(aq) + HSO₄-(aq)
• D. Ba(OH)₂(aq) + Na₂CO₃(aq) → BaCO₃(s) + 2 NaOH(aq)
• E. 3 NaOH(aq) + NiBr₃(aq) → Ni(OH)₃(s) + 3 NaBr(aq)

Answer: (C)