Biomolecules Part 1

Sucrose (cane sugar), lactose (milk sugar) and maltose are disaccharides in which two monosaccharides are hold together by a glycosidic linkage.
(A) In sucrose, ${\mathit{C}}_1$ of $\mathit{\alpha }-\mathit{D}-$ glucose and ${\mathit{C}}_2$ of $\mathit{\beta }-\mathit{D}-$ fructose are linked together (ii).
(B) In lactose, ${\mathit{C}}_1$ of $\mathit{\beta }$ - D-galactose and ${\mathit{C}}_4$ of $\mathit{\beta }$-D-glucose are linked together (i).
(C) In maltose, ${\mathit{C}}_1$ of $\mathit{\alpha }-$ D-glucose is linked to ${\mathit{C}}_4$ of another $\mathit{\alpha }-\mathit{D}-$ glucose unit (iii).So, option (c) is the correct answer.