The answer is B. They bring oxygen from the air into the body.
The lungs don’t produce or release oxygen so it’s not A. or D. The lungs do not transform oxygen into carbon dioxide cause our bodies need oxygen not carbon dioxide so it’s not C. Hope this helps!
I would say D it seem to be the likely choice but not a 100%
DNA:GCTAGCAG
RNA:CGAUCGUC therefore, C is the correct answer.