In which reaction does water act as a Brønsted-Lowry base?
- A$\text{H}_2\text{O} + \text{Na} \rightarrow \text{NaOH} + \tfrac{1}{2}\text{H}_2$
- B$\text{H}_2\text{O} + \text{H}_3\text{PO}_4 \rightarrow \text{H}_3\text{O}^+ + \text{H}_2\text{PO}_4^-$
- C$\text{H}_2\text{O} + \text{CaO} \rightarrow \text{Ca(OH)}_2$
- D$\text{NH}_3 + [\text{Cu(H}_2\text{O)}_6]^{2+} \rightarrow \text{NH}_4^+ + [\text{Cu(H}_2\text{O)}_5(\text{OH})]^+$