The correct option is A Lipids
Polysaccharides are polymers made up of monomeric monosaccharide units.
Nucleic acids are polymers made up of monomeric nucleotide units.
Proteins are polymers made up of monomeric amino acid units.
Lipids are made up of fatty acids and alcohols (mostly glycerols) and may also contain some additional groups (in case of compound or conjugated lipids). They are insoluble in water and are not polymeric.