Refer to the Figures Below Showing the Structures of Cellulose $\alpha$

Refer to the figures below showing the structures of cellulose and chitin. What is a difference that distinguishes these two polysaccharides from each other?

A) One contains a hexose monomer, while the other contains a pentose monomer.
B) One is a linear polymer, while the other is branched.
C) One contains $\alpha$ -1,4 glycosidic linkages, while the other contains $\beta$ -1,4 glycosidic linkages.
D) One contains glucose monomers, while the other contains N-acetyl-glucosamine monomers.
E) One contains glucose monomers, while the other contains glucosamine monomers.