Final answer:
tRNAs are attached to the correct amino acids by option A: aminoacyl tRNA synthetases, which are enzymes specific to each of the twenty amino acids.
Step-by-step explanation:
tRNAs become attached to the correct amino acid through the action of enzymes called option A: aminoacyl tRNA synthetases.
This process is also known as 'charging' the tRNA. Each of these enzymes is specific to one of the twenty amino acids and facilitates the attachment of the amino acid to its corresponding tRNA by first binding and hydrolyzing ATP. The result is a high-energy bond formed between the amino acid and adenosine monophosphate (AMP). Subsequently, the amino acid is transferred to the tRNA, thus effectively 'charging' it for protein synthesis during the process of translation.