Which of the following processes is the first event to take place in translation?

• A. Base pairing of charged methionine-tRNA to AUG of the messenger RNA.
• B. Binding of the larger ribosomal subunit to smaller ribosomal subunits.
• C. The ribosome reaches a stop codon.
• D. The small subunit of the ribosome recognizes and attaches to the mRNA.