(D) The chemical formula is $HO-CH(CN)_2$.In this molecule,the central carbon atom is bonded to one hydrogen atom $(H)$,one hydroxyl group $(-OH)$,and

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(D) The chemical formula is $HO-CH(CN)_2$.In this molecule,the central carbon atom is bonded to one hydrogen atom $(H)$,one hydroxyl group $(-OH)$,and two cyano groups $(-CN)$.The bond line formula represents the central carbon as a vertex where the bonds to $-OH$ and two $-CN$ groups originate.Option $D$ correctly represents this connectivity in a simplified bond line notation.