It would be A: Ribosomes because its made out of small structures. amio acids are assembled to make protiens. Which is why its given the nickname "Protien factory". But is found in both animal and cell.
Ribosomes is the site for protein synthesis. Endoplasmic reticulum can MODIFY the protein. The Golgi apparatus transports the protein. The centriole is ONLY in animal cells and is for cell division.