Final answer:
Option (C), The Phenylalanine-tRNA complex will attach to the A site of the ribosome during protein synthesis, as it has the AAG anticodon pairing with the UUC codon on mRNA.
Step-by-step explanation:
The question is asking about the specific tRNA amino acid complex that will attach to the A site of the ribosome during the process of protein synthesis. Based on the provided information, since the anticodon on the tRNA is AAG, it will pair with the UUC codon on the mRNA.
The tRNA molecule with this anticodon carries the amino acid phenylalanine. Therefore, the tRNA amino acid complex that will attach to the A site at this time is the Phenylalanine-tRNA complex (C).