Some plastics are not elastics. Some rubbers are not fibres. Some elastics are not fibres.
Some plastics are fibres. (I) + No fibre is a elastics. (E) ⇒ Some plastics are not elastics. (0) No fibre is an elastics. (E) + Some elastics are rubbers. (I) ⇒ Some rubbers are not fibres. (O*). No fibre is a elastics. (E) ⇒ Conversion ⇒ Some elastics are not fibres. (O) Hence, option 2 is correct.
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