In each of the following reactions the role of water is 

(i) $$\text{H}_2\text{O} + \text{HCl} \rightarrow \text{H}_3\text{O}^+ + \text{Cl}^-$$ 

(ii) $$6\text{H}_2\text{O} + \text{Mg}^{2+} \rightarrow [\text{Mg(H}_2\text{O})_6]^{2+}$$ 

(iii) $$2\text{H}_2\text{O} + 2\text{F}_2 \rightarrow 4\text{HF} + \text{O}_2$$

A

(i) oxidant, (ii) reductant, (iii) base

B

(i) reductant, (ii) oxidant, (iii) base

C

(i) base, (ii) base, (iii) reductant

D

(i) acid, (ii) base, (iii) reductant