Which of the following best compares the structure of carbohydrates and nucleic acids?
a. carbohydrates consist of monomers of carbon, hydrogen, and oxygen, while nucleic acids consist of monomers of a sugar, a phosphate group, and a nitrogenous base.
b. carbohydrates have four rings containing carbon, hydrogen, and oxygen, while nucleic acids have subunits containing an amino acid and a phosphate group.
c. carbohydrates contain carbon, hydrogen, and oxygen and have a hydrophobic end and a hydrophilic end, while nucleic acids contain a carbon backbone, a side change, and an amino group.