Which of the following best explains how the structures of chitin and cellulose make them hard to digest?
a. they both have branching chains of glucose molecules, but cellulose can be digested and chitin cannot.

b. they both have an alternating arrangement of glucose molecules, but only chitin has the ability to store glucose.

c. they both have branching chains of glucose molecules, but only cellulose provides structure and support to the organism.

d. they both have an alternating arrangement of glucose molecules, but cellulose has hydrogen bonds while chitin has amino group bonds.

is it a., c., or neither, lol.