Find out correct reducing agent A, B, C, D
respectively for group reduction.
A. `Fe+HCl,LiAlH_(4), Na.Hg+H_(2)O,H_(2)+Ni`
B. `Na.Hg+H_(2)O,Fe+HCl,LiAlH_(4),H_(2)+Ni`
C. `H_(2) + Ni,Na.Hg+H_(2)O,Fe+HCl, LiAlH_(4)`
D. `H_(2)+Ni,Fe+HCl, Na.Hg+H_(2)O,LiAlH_(4)`