Concept:Natural fibres come from plants, animals, or insects. Synthetic fibres are man-made in factories.
Explanation:Linen is made from flax plant fibres.
Cotton comes from the cotton plant's fruit (cotton boll).
Jute is obtained from jute plant stems.
All three are natural fibres.
Rayon is produced chemically from cellulose, so it is a synthetic fibre (man-made).
Therefore, Rayon is not a natural fibre.
Answer:C. Rayon