Answer:
the nucleus
Step-by-step explanation:
Options: nucleus, chloroplast, mitochondria, cell membrane
The nucleus is an organelle that primarily controls and coordinates the activities of eukaryotic cells such as growth, reproduction, protein synthesis and other metabolisms of the cell in addition to storing the genetic materials of the cell.
The chloroplast is an organelle found only in plant cells and is responsible for carrying out photosynthesis.
The mitochondria is an organelle responsible for the generation of energy within the cell.
The cell membrane delimits the cell's contents and controls the movement of substances in and out of the cell.
The correct option is therefore, the nucleus.