(A) Elastomers are polymers in which the polymer chains are held together by the weakest intermolecular forces. These weak forces permit the polymer t

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(A) Elastomers are polymers in which the polymer chains are held together by the weakest intermolecular forces. These weak forces permit the polymer to be stretched. Buna-$S$ is a synthetic rubber,which is a classic example of an elastomer. Nylon and Terylene are fibers,and $PVC$ is a thermoplastic.