To solve this problem, we need to match the items in List I with the appropriate bonds in List II. Let's analyze each item:$\newline \bullet\$a. Protein:$\newline$Proteins are composed of amino acids linked together by peptide bonds.$\newline$This matches with (iv) Peptide bonds.$\newline \bullet$b. Unsaturated fatty acid:$\newline$Unsaturated fatty acids contain one or more C=C double bonds in their hydrocarbon chain.$\newline$This matches with (i) C=C double bonds.$\newline \bullet\$c. Nucleic acid:$\newline$Nucleic acids, such as DNA and RNA, have nucleotides linked by phosphodiester bonds. $\newline$This matches with (ii)$$Phosphodiester bonds.$\newline \bullet\$d. Polysaccharide:$\newline$Polysaccharides are carbohydrates formed by monosaccharides linked by glycosidic bonds.$\newline$This matches with (iii)$$Glycosidic bonds.$\newline\newline$Now, let's match the items from List I with List II:$\newline a \rightarrow (iv) \newline b \rightarrow (i) \newline c \rightarrow (ii) \newline d \rightarrow (iii) \newline \newline\textbf{This corresponds to Option 1}.$