Final answer:
The correct answer is c. ribose.
Step-by-step explanation:
The correct answer is c. ribose. DNA (deoxyribonucleic acid) is composed of nucleotides, which are made up of three components: a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base (adenine, cytosine, guanine, or thymine). Ribose is a sugar molecule found in RNA (ribonucleic acid), not DNA. Therefore, ribose is not a constituent of deoxyribonucleotides found in DNA.