The reagent(s) required for the following conversion are:

Options

1. A(i) $\mathrm{NaBH}_4$, (ii) Raney $\mathrm{Ni} / \mathrm{H}_2$, (iii) $\mathrm{H}_3 \mathrm{O}^{+}$
2. B(i) $\mathrm{LiAlH}_4$, (ii) $\mathrm{H}_3 \mathrm{O}^{+}$
3. C(i) $\mathrm{B}_2 \mathrm{H}_6$, (ii) $\mathrm{DIBAL-H}$, (iii) $\mathrm{H}_3 \mathrm{O}^{+}$
4. D(i) $\mathrm{B}_2 \mathrm{H}_6$, (ii) $\mathrm{SnCl}_2 / \mathrm{HCl}$, (iii) $\mathrm{H}_3 \mathrm{O}^{+}$