Protein are synthesized by ribosome. The correct option is B, ribosome.
What is ribosome?
Ribosomes are small spherical organs that are present in the cytoplasm. They are the main site of protein synthesis.
They consist of RNA and  associated protein. They link amino acid together by the order of codons given by messenger RNA.
Thus, the correct option is B: ribosomes.
Learn more about ribosome
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