Correct Answer: Option C

Explanation

DNA is a very large molecule (a polymer) made up of repeating smaller units called nucleotides. Each nucleotide in a DNA molecule consists of three components: 

- A phosphate group.

- A deoxyribose sugar (a pentose sugar).

- One of four nitrogenous bases (adenine, guanine, cytosine, or thymine). 

There is an explanation video available below.

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