In the structure of DNA, the sugar-phosphate backbone is primarily composed of which components?

• A. Alternating deoxyribose sugars and nitrogenous bases linked by glycosidic bonds
• B. Alternating ribose sugars and amino acids linked by peptide bonds
• C. Alternating deoxyribose sugars and phosphate groups linked by phosphodiester bonds
• D. Alternating nitrogenous bases and phosphate groups linked by hydrogen bonds

Answer: (C)