Ribosomes are protein factories since they help in the synthesis of proteins. ribosomes are scattered around in cytoplasm and also in mitochondria . thus,op C.

Protein synthesis is the process by which cells build proteins using the information encoded in their DNA. This process is essential for the growth, repair, and functioning of cells. In animal cells, protein synthesis occurs in various cellular compartments, including the cytoplasm, nucleolus, and mitochondria.

**Protein synthesis in the cytoplasm:**
The majority of protein synthesis in animal cells occurs in the cytoplasm. This is where the ribosomes, the cellular machinery responsible for protein synthesis, are located. Ribosomes are composed of two subunits, the large and small subunits, which come together during protein synthesis. They provide the physical platform for the assembly of amino acids into polypeptide chains, which eventually fold into functional proteins.

**Protein synthesis in the nucleolus:**
The nucleolus is a specialized region within the nucleus of the cell. It is involved in the production and assembly of ribosomal subunits. The nucleolus contains a high concentration of ribosomal RNA (rRNA) genes, which are transcribed into large precursor molecules of rRNA. These precursor molecules undergo processing and modification to form mature rRNA, which combines with proteins to form ribosomal subunits. These subunits are then transported to the cytoplasm, where they participate in protein synthesis.

**Protein synthesis in mitochondria:**
Mitochondria are often referred to as the "powerhouses" of the cell because they generate most of the cell's energy in the form of ATP. However, mitochondria also have their own genome and are capable of synthesizing a small number of proteins. Mitochondrial protein synthesis occurs on specialized ribosomes located within the mitochondria. These ribosomes are structurally different from the cytoplasmic ribosomes and are thought to have evolved from ancestral bacteria.

**Conclusion:**
In summary, protein synthesis in animal cells takes place in the cytoplasm, nucleolus, and mitochondria. The majority of protein synthesis occurs in the cytoplasm, where ribosomes translate mRNA into proteins. The nucleolus is involved in the production and assembly of ribosomal subunits, while mitochondria have their own specialized ribosomes for synthesizing a small number of proteins. Therefore, option C, which states that protein synthesis occurs on ribosomes present in the cytoplasm as well as in mitochondria, is the correct answer.