Which of the Following Represents an Example of a Proteoglycan

Which of the following represents an example of a proteoglycan?

A) attachment of several molecules of heparin to the peptide antithrombin III
B) attachment of a Gal-β(1,3) -GalNAc disaccharide to the fish antifreeze protein
C) attachment of a small oligosaccharide to an immunoglobulin
D) attachment of a small antigenic determinant to a membrane bound protein of a cell
E) none of the above