Answer: C. Man-made fibres are long thin polymer threads — primarily nylon and polyester. Their typical applications are clothing fabrics, fishing line (nylon), and parachutes (also nylon). All three are 'thread-like' uses where strength along a single direction matters.
Cling film and plastic bags appear in some distractor options, but those are plastic films (poly(ethene)), not fibres. Films are sheet-like, made from blown or extruded plastic, and serve a different role from spun fibres.
Sleeping bags use synthetic insulation, but their primary fibre identity is less clean than the trio in option C, which is unambiguously fibre-only.
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