The correct option is B Methionine
"AUG" is the most common start/initiation codon. The start codon specifies the first codon of mRNA transcript that is translated by a ribosome. It codes for methionine in eukaryotes and a modified Met in prokaryotes. Option A is correct. GUA and GUG code for valine; UAU and UAC code for tyrosine; UUU and UUC code for Phenylalanine.