Answer:
C. They contain sugars, phosphate, and nitrogenous bases
Step-by-step explanation:
A. is wrong because only RNA is made up of single strands of nucleotides, while DNA is a double-stranded helix.
B. is wrong because DNA and RNA are examples of nucleic acids, not carbohydrates
D. is wrong because only RNA contains uracil, while DNA has thymine instead of uracil.
C. is correct because both DNA and RNA have sugar-phosphate backbones and nitrogenous bases. The difference between RNA and DNA is seen in their names--deoxyribo nucleic acid (DNA) vs. ribo nucleic acid (RNA). Ribose is a type of sugar, the same as found in RNA, while deoxyribose (in DNA) is the same except for not having an oxygen atom on the 2' Carbon (de-oxy = without oxygen).