Why Is the Genetic Code Described as a Triplet Code

Why is the genetic code described as a triplet code?

A) It is described as a triplet code because 3 ATP molecules are required to produce each protein.
B) It is described as a triplet code because a sequence of three nitrogenous bases specifies the identity of a specific amino acid.
C) It is described as a triplet code because a minimum of three amino acids are required to produce a functional protein.
D) It is described as a triplet code because three RNA molecules participate in the transcription of the DNA.
E) It is described as a triplet code because there are three nucleotides in DNA.