Question

a in the nucleus
b in the cytoplasm
c in the ribosome
d in the mitochondria

Explanation:

The diagram shows the process of translation, where messenger RNA (mRNA) is used to synthesize a protein. The final step of protein synthesis (translation) occurs in the cytoplasm, specifically on ribosomes, but the location labeled for the protein production step shown (in the cytoplasmic region) matches the cytoplasm as the site. Ribosomes are structures within the cytoplasm where this happens, but the option for cytoplasm is the correct broader location here, as the diagram's cytoplasmic area is where the protein is being formed.

Answer:

B. in the cytoplasm