This question is incomplete because of the absence of the diagram mentioned in the question. However, when the diagram is viewed, identify/label single unit (of a molecule) that is repeated as monomer. The entire stretch of the repeated units (monomers) should be labelled as polymer.
NOTE:
Monomers are simple units/building blocks of polymers. For example, glucose molecule (in a dextran) is a monomer and ethene (in polythene) is a monomer
Polymers are large molecules consisting of repeated units of monomers. Examples are polysaccharides (such as dextran) and polythene
