The correct answer is a - transfer amino acids to the ribosomes.
In the nucleus, information to synthesize a particular protein is transcribed from DNA and onto messenger RNA (mRNA).
mRNA leaves the nucleus and enters the cytoplasm of the cell where it attaches to a ribosome. tRNA then begins to read(translate) the information on the attached mRNA, and corresponding to this information, fetches amino acids from the pool of free amino acids in the cytoplasm and brings them to the ribosome where they get linked together into a long chain or polymer, forming the primary structure of the protein.
