Here's a problem to solve: In organisms, macromolecules are made up of subunits. Which of these pairs correctly describes how a macromolecule is constructed?

Among the 4 following options, which is the correct answer?

- A: DNA is made up of nucleic acids.
 
- B: Protein is made up of amino acids.
 
- C: Nucleic acids are made up of DNA.
 
- D: Amino acids are made up of protein.
 