Evaluating polymer composition and reactions

Steps:

• Recall that polymers are large molecules from repeating units; classify types like addition vs. condensation.
• Examine each option: A checks linkages in synthetic polymers, B checks polymerization type, C checks hydrolysis products, D checks elemental composition of natural polymer.
• Verify facts: Nylon is polyamide (amide links), Terylene is polyester (ester links); both from condensation; starch is carbohydrate.
• Select option matching verified chemistry.

Why D is correct:

• Starch is a polysaccharide with formula (C6H10O5)n, composed only of carbon, hydrogen, and oxygen as a carbohydrate.

Why the others are wrong:

• A: Terylene contains ester linkages, not amide.
• B: Both are condensation polymers, not addition.
• C: Protein hydrolysis yields amino acids, not sugars.

Final answer: D