$A$ codon has a sequence of $\underline{A}$,and specifies a particular $\underline{B}$ that is to be incorporated into a $\underline{C}$. What are $\underline{A}, \underline{B}, \underline{C}$?
$\underline{A} \quad \underline{B} \quad \underline{C}$

• A
  $3$ bases,amino acid,carbohydrate
• B
  $3$ acids,carbohydrate,protein
• C
  $3$ bases,protein,amino acid
• D
  $3$ bases,amino acid,protein