The correct answer is Protein synthesis. 

• Ribosomes are membranous granular structures present in the cytoplasm.
• They were first observed under an electron microscope as dense particles by George Palade in the year 1953.
• Ribosomes are the site for ”protein synthesis” so they are also called the ”protein factory” of the cell.
• There are two types of ribosomes

1. Eukaryotic ribosomes – 80s – occurs in the cytoplasm of eukaryotic cell
2. Prokaryotic ribosomes – 70s – occur in the cytoplasm as well as are associated with the cell membrane of prokaryotic cell

• Composition of the structure of ribosome:
• They are composed of ribonucleic acid (RNA) and proteins

• Photosynthesis: It is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. In this process, plant the chlorophyll, carbon dioxide, water, sunlight, and release oxygen.
• Synthesis of Fatty acids occurs in the cytoplasm.