The correct option is B AUG
AUG acts as the standard start (or initiation) codon.
In the genetic code, a stop codon (or termination codon) is a nucleotide sequence within mRNA that signals a termination of translation. Stop codon signal the termination of this process by binding release factors, which cause the ribosomal subunits to dissociate, releasing the amino acid chain.
In the standard genetic code, there are three stop codons (for RNA/DNA) respectively.
They are UAG, UAA and UGA in RNA. And TAG, TAA and TGA in DNA.