Remember that rubbers (like Buna-S, Buna-N, Neoprene) are always elastomers.
Resins (like Bakelite, Melamine, Urea-formaldehyde) are thermosetting polymers.
This allows you to quickly eliminate wrong options.
Step 1: Recall the classification logic behind the four polymer types. They're grouped by intermolecular force strength, elastomers have the weakest interchain forces, thermoplastics sit in the middle, fibres have the strongest forces (often from hydrogen bonding), and thermosetting polymers are permanently cross-linked networks. Step 2: Use that strength ranking as a filter instead of memorising pairs blindly. A rubbery, elastic material with weakly held coiled chains slots into elastomers, while a strong, thread-like material built for tensile strength slots into fibres, and so on for the other two categories. Step 3: Match each labelled item in the list against this logic one at a time. Running through all four items this way lines them up consistently with their known real-world identities. Final answer: Option 3, A-III, B-I, C-IV, D-II.
