Final answer:
Nucleic acids contain the most phosphorus. They are composed of nucleotides which include a phosphate group along with a pentose sugar and a nitrogen-containing base.
Step-by-step explanation:
Nucleic acids like DNA and RNA contain the elements carbon, hydrogen, oxygen, nitrogen, and phosphorus. Therefore, out of the options provided, nucleic acids generally contain the most phosphorus. The building blocks of nucleic acids are nucleotides, each consisting of a pentose sugar, a phosphate group, and a nitrogen-containing base. In DNA, the sugar is deoxyribose and the nitrogen bases are adenine, cytosine, guanine, and thymine; while in RNA, the sugar is ribose and the nitrogen bases are adenine, cytosine, guanine, and uracil.