The fourth codon in an mRNA is GGG, which specifies glycine. Assuming that no amino acids are removed from the polypeptide, which of the following statements is correct? （ ）

A、The third amino acid from the N-terminus is glycine.
B、The fourth amino acid from the N-terminus is glycine.
C、The third amino acid from the C-terminus is glycine.
D、The fourth amino acid from the C-terminus is glycine.