Final answer:
Cotton is comprised of approximately 95% cellulose, making it almost entirely cellulose, which serves as the structural component of the plant cell walls and contributes to its durability in textiles.
Step-by-step explanation:
The percentage of cotton that is made up of cellulose is very high, as cotton fibers consist almost entirely of this organic compound. The most correct option from the given choices would be (D) 80%, but it is important to note that cotton fibrils are, in fact, approximately 95% cellulose. Cellulose is a polysaccharide made up of glucose units linked together, and it serves as the structural component of the plant cell walls, making cotton durable and suitable for clothing and textiles. As a result of its cellulose content, cotton does not stretch easily and is valued for its durability and strength in fabrics.