The correct option is C Starch
Natural Polymers are those substances which are obtained naturally.
Polyester is a synthetic fiber derived from coal, air, water, and petroleum.
Glyptal is formed by ethylene glycol and phthalic acid formed by step-growth polymerization.
Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants as energy storage and hence, naturally occurring polymer.
Nylon-6 is made from one kind of monomer called caprolactam.
Hence, option C is correct.