Recall the structure of amylopectin

Amylopectin is a branched polysaccharide present in starch.

Monomer unit in amylopectin

Amylopectin is made up of $\alpha$-D-glucose units.

Type of glycosidic linkages

• The main chain has $\alpha(1\to 4)$ glycosidic linkages, i.e. $C_1-C_4$ linkage.
• The branching points have $\alpha(1\to 6)$ glycosidic linkages, i.e. $C_1-C_6$ linkage.

Check each option

• A: $\alpha$-D-glucose, $C_1-C_4$ and $C_1-C_6$ linkages
  ✅ Correct
• B: $\beta$-D-glucose, $C_1-C_4$ and $C_2-C_6$ linkages
  ❌ Wrong monomer and wrong branching linkage
• C: $\beta$-D-glucose, $C_1-C_4$ and $C_1-C_6$ linkages
  ❌ Wrong monomer; amylopectin contains $\alpha$-D-glucose, not $\beta$-D-glucose
• D: $\alpha$-D-glucose, $C_1-C_4$ and $C_2-C_6$ linkages
  ❌ Wrong branching linkage; it should be $C_1-C_6$

Final answer

Therefore, amylopectin is composed of $\alpha$-D-glucose units with $C_1-C_4$ and $C_1-C_6$ linkages.