For protein synthesis, the amino acids are recognized and carried by: a) mRNA b) snRNA c) miRNA d) tRNA

In the process of protein synthesis, transfer RNA (tRNA) plays the critical role of an adapter molecule. It is responsible for recognizing specific codons on the messenger RNA (mRNA) through its anticodon arm and carrying the corresponding amino acids to the ribosome [1]. Each tRNA molecule is specific to a particular amino acid, which is attached to its 3' acceptor site by enzymes called aminoacyl-tRNA synthetases [1]. During translation, the tRNA delivers these amino acids to the growing polypeptide chain by base-pairing its anticodon with the complementary mRNA codon. While mRNA provides the genetic blueprint and rRNA forms the structural and catalytic core of the ribosome, only tRNA serves as the physical link that carries amino acids to the site of synthesis [1]. Other RNAs like snRNA and miRNA are involved in splicing and gene regulation, respectively, rather than direct amino acid transport.

Sources

1. [1] https://www.ncbi.nlm.nih.gov/books/NBK558999/