The correct answer is d) nucleic acids.
Nucleic acids, such as DNA and RNA, are considered organic macromolecules and are also polymers made up of nucleotide monomers.
- Amino acids (a) are the building blocks of proteins, but by themselves, they are not polymers; they form proteins when they polymerize.
- Water (b) is not an organic molecule or a polymer; it is a simple inorganic compound.
- Monosaccharides (c) are simple sugars and also not polymers; they are the monomer units that can combine to form polysaccharides.
Therefore, nucleic acids are the most fitting choice among the options provided.
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