Messenger RNA (mRNA) contains the instructions for — A. building mitochondria
B. protein assembly
C. DNA replication
D. RNA synthesis

Answer B, explanation: The mRNA directs the synthesis of proteins, which occurs in the cytoplasm. mRNA formed in the nucleus is transported out of the nucleus and into the cytoplasm where it attaches to the ribosomes. Proteins are assembled on the ribosomes using the mRNA nucleotide sequence as a guide.

here's your answer.. Option (C): the sun