The correct option is B P
The given diagram is plant cell because cell is surrounded by the cell wall and have single large vacuole at the center of the cell whereas nucleus (P) is present at the side of the vacuole. The nucleus is called as the regulatory body of the cell or brain of the cell because it contains the genetic material and controls the cellular activities by controlling the protein synthesis. Whereas Q represents the vacuole, R represents the mitochondria, S represents the cytoplasm.