To solve this problem, we need to understand the process of translation in protein synthesis. Translation is the process by which mRNA is decoded to produce a specific polypeptide or protein. Let's analyze the steps involved:$\newline \bullet$Translation begins when the small subunit of the ribosome binds to the mRNA. This is the initiation step of translation.$\newline \bullet$The small subunit scans the mRNA for the start codon (AUG), which is the signal for the beginning of protein synthesis.$\newline \bullet$Once the start codon is recognized, the initiator tRNA carrying methionine binds to the start codon.$\newline \bullet$After this, the large subunit of the ribosome joins the complex, forming a complete ribosome ready for elongation.$\newline$Based on this understanding, the process of translation begins as soon as the small subunit of the ribosome encounters mRNA.$\newline$Therefore, the correct option is Option 1.