a. nucleic acids; nucleotide This answer is not right because nucleic acids are composed by nucleotides then nucleotides are the monomers of nucleic acids.
b. protein; amino acid
. This question is not right because proteins are composed by aminoacids that means that aminoacids are monomers of proteins.
c. starch; lipid. This question is right because starch is composed by monosaccharides so monosaccharides are monomers of starch not lipids.