Final answer:
A large molecule made of subunits containing a sugar and a nitrogenous base is a nucleic acid, whose subunits are called nucleotides, consisting of a five-carbon sugar, a phosphate group, and a nitrogenous base like in DNA and RNA.
Step-by-step explanation:
A large molecule whose subunits consist of a sugar and a nitrogenous base is called a nucleic acid. The subunits of nucleic acids are known as nucleotides, which are composed of three parts: a five-carbon sugar (either ribose in RNA or deoxyribose in DNA), a phosphate group, and a nitrogenous base. These nucleotides are the building blocks of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), which serve as the genetic material in cells and are responsible for carrying and retaining hereditary information. Therefore, the correct answer to the question is C. Nucleic acid.