The polymer, which can be stretched and retains its original status on releasing the force is
Bakelite.
Nylon 6,6.
Buna-N.
Terylene.
Elastomers can be stretched and they regain their original status when the force is released.
Out of the given polymers, Buna-N is synthetic rubber and is an elastomer.
Hence, correct option is 3.
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