Answer:
The true statement among the options is:
**b Nucleic acids are composed of subunits called nucleotides.**
Nucleic acids, such as DNA and RNA, are large biomolecules composed of repeating units called nucleotides. These nucleotides are the building blocks of nucleic acids and consist of a phosphate group, a sugar molecule, and a nitrogenous base. They are linked together to form the polymer chains of nucleic acids.