The correct answer is D. tRNA carries amino acids to the ribosomes and helps form proteins.
tRNA (transfer RNA) is essential in the translation process, where it serves as a bridge between the mRNA sequence and the corresponding amino acids. Each tRNA molecule carries a specific amino acid and matches its anticodon with the codon on the mRNA strand, facilitating the assembly of amino acids into a growing polypeptide chain, ultimately leading to protein synthesis.