The second pircture is the suggested answer, i cant understand the answer, especially the bottom reaction.

(a) Identify reagents and conditions and missing structures given by letters A - F in the following schemes (i) and (ii). Give mechanisms for all of the reactions. Explain the stereoselectivity in the formation of products C and FF (i) B HOPh LiAlH4 then aqueous workup: c D (ii) Q4 Partially seen - some reactions and stereochemical principles seen, different examples and combinations unseen. (a) A- PhMgMr, cat Cu(I)Cl,Et2O,BPhMgBrEt2O, C - Cis-alcohol, D conjugated alkene, E - BnBr,F - Benzylated ketone with axial Bn group (trans). Mechanisms for all steps. Formation of C by axial attack of hydride (avoids torsional strain with small nucleophile) to give equatorial alcohol. Formation of F by axial attack to chair (avoiding twist boat). (a) Identify reagents and conditions and missing structures given by letters A - F in the following schemes (i) and (ii). Give mechanisms for all of the reactions. Explain the stereoselectivity in the formation of products C and F. (i) LiAlH4 then aqueous workup C D (ii)