Which one of the following pairs is not correctly matched?

The correct answer is (b). Rayon is a semi-synthetic fiber made from cellulose, a natural polymer. It is not a modified starch.

Wool is a natural fiber made from the hair of sheep. It is a protein fiber.

Rubber is a natural polymer made from the sap of rubber trees. It is an elastomer, a material that can be stretched and then returns to its original shape.

Fullerene is an allotrope of carbon, meaning that it is a form of carbon with a unique atomic structure. Fullerenes are spherical or ellipsoidal molecules made up of carbon atoms arranged in a honeycomb lattice.