In Which of the Following Cases Is Water Acting as a Base

Multiple Choice

In which of the following cases is water acting as a base under the Lewis definitions, but not under the Br∅nsted-Lowry definitions?

A) H₂O(l) + HF(g) ⇌ H₃O⁺(aq) + F(aq)
B) H₂O(l) + CN-(aq) ⇌ OH^-(aq) + HCN(aq)
C) H₂O(l) + Cu²⁺(aq) ⇌ Cu(H₂O) ²⁺(aq)
D) H₂O(l) + PO₄^3-(aq) ⇌ 2OH-(aq) + H₂PO₄^-(aq)
E) H₂O(l) [electrolysis] ⇌ 2H₂(g) + O₂(g)