The correct option is B (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
Proteins, nucleic acids and polysaccharides are polymers that are made up of repeating subnits known as monomers linked to each other.
Amino acids are the monomers of proteins and are linked to each other by means of peptide bonds.
Nucleotides are the monomers of nucleic acids and are linked to each other by means of phosphodiester bonds.
Monosaccharides are monomers of polysaccharides and are linked to each other by means of glycosidic bonds.
Unsaturated fatty acids are a type of fatty acids which contain one or more C=C double bonds.