Question

synthetic fibers, such as nylon, are made of long-chain
monomers.
multimers.
polymers.
carbohydrates.

Explanation:

Synthetic fibers like nylon are large molecules formed by linking many small repeating units (monomers) into long chains, which defines a polymer. Multimers refer to protein complexes, and carbohydrates are a different class of biomolecules not related to nylon's structure.

Answer:

polymers.