The correct matchings are : (A) Protein - This is a polymer made up of amino acids linked by peptide bonds. So, (A) matches with (IV) Peptide bonds. (B) Unsaturated fatty acid - These have one or more C=C double bonds in their hydrocarbon chain. So, (B) matches with (I) C=C double bonds. (C) Nucleic acid - These are polymers made up of nucleotides linked by phosphodiester bonds. So, (C) matches with (II) Phosphodiester bond. (D) Polysaccharide - These are polymers made up of monosaccharides linked by glycosidic bonds. So, (D) matches with (III) Glycosidic bonds. So, the correct answer is Option C : (A)-(IV), (B)-(I), (C)-(II), (D)-(III).