How is the 4-letter language of nucleic acids converted into the 20-word language of amino acids? ...

How is the 4-letter language of nucleic acids converted into the 20-word language of amino acids?
  a. The 4 nucleic acid bases combine in 2-letter combinations that define different amino
  acids.
  b. The 4 nucleic acid bases combine in 3-letter sequences that define different amino acids.
  c. Triplets of the 2-letter nucleic acid bases are translated into the 20 different amino acids.
  d. The 4 bases each specify 1 amino acid, which give rise to the remaining 16 amino acids.
  e. The 4 bases are first converted into tRNA molecules, which can each attach to 5 amino
  acids.

Question 2

Refer to Figure 13-2. The portion of the molecule labeled 5 is:
  a. the attached amino acid.
  b. a double-stranded region.
  c. a single-stranded region.
  d. the anticodon.
  e. the codon.