The statement that best describes DNA is:
"DNA stores an organism’s genetic code."
This statement accurately reflects the primary function of DNA, which is to encode the genetic information necessary for the growth, development, functioning, and reproduction of living organisms.
The other statements contain inaccuracies or are misleading in the context of DNA's role and structure. For example, chromosomes are composed of DNA wrapped around proteins, but this does not mean that they are condensed into DNA. Additionally, DNA is not found in ribosomes; instead, ribosomes are the cellular machinery that synthesize proteins based on the instructions provided by messenger RNA (mRNA), which is transcribed from DNA. Lastly, while segments of DNA (genes) do serve as instructions to produce proteins, this statement mischaracterizes the structure and function of DNA in a broader sense.