Synthetic fibres are defined as:

• A. Fibres made from a man-made material that are spun into a thread.
• B. Natural fibres from plants.
• C. Fibres that cannot be dyed.
• D. Metal fibres.

Answer: (A)

Synthetic fibres are created from human-made polymers that are produced through chemical processes and then formed into thin filaments by extrusion and drawing, which are spun into yarn or thread. This makes them distinct from natural fibres, which come directly from plants or animals. The statement captures the essential idea: a fibre that comes from a man-made material and is processed to be spun into a thread.

Natural fibres from plants, for example, are not synthetic, and metal fibres are not polymer-based fibres used in textiles. Many synthetic fibres are designed to take dyes readily, so the claim that they can’t be dyed doesn’t fit the usual properties of synthetic fibres.