Which reaction counts as a neutralisation reaction?
- A$\text{AgNO}_3 + \text{HCl} \rightarrow \text{AgCl} + \text{HNO}_3$
- B$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$
- C$4\text{Na} + \text{O}_2 \rightarrow 2\text{Na}_2\text{O}$
- D$2\text{NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}$