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From the following \( E^{\circ} \) values for the half-cells:
(i) \( \mathrm{D} \rightarrow \mathrm{D}^{2+}+2 \mathrm{e}^{-} ; E^{\circ}=-1.5 \mathrm{~V} \)
(ii) \( \mathrm{B}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{B} ; E^{\circ}=-0.5 \mathrm{~V} \)
(iii) \( \mathrm{A}^{3-} \rightarrow \mathrm{A}^{2-}+\mathrm{e}^{-} ; E^{\circ}=1.5 \mathrm{~V} \)
(iv) \( \mathrm{C}^{2+}+\mathrm{e}^{-} \rightarrow \mathrm{C}^{+} ; E^{\circ}=+0.5 \mathrm{~V} \)
Which combination of two half-cells would result in a cell with largest potential?
(a) i and iii
(b) i and iv
(c) iii and iv
(d) ii and iv
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