Which macromolecule (or polymer) is properly matched with its subunit (or monomer)?

A polymer is a compound that consists of a single repeat unit, known as its monomer. In order to identify the monomer of a polymer, we simply look at the part of the polymer that is repeating to form the polymer chain. After this part is identified, we write it separately and "close" its bonds by connecting the terminal atoms with atoms within the chain.

3. is true i think i should be right