The correct answer is option 4, Medulla Oblongata. The Medulla Oblongata is located at the base of the brainstem and is responsible for controlling various vital functions of the body, including the activities of internal organs. It serves as a relay station between the brain and the spinal cord. The Medulla Oblongata plays a crucial role in regulating autonomic functions such as heart rate, blood pressure, respiration, and digestion. It also controls reflexes such as swallowing, coughing, and sneezing.
Option 1, Spinal cord, is not the correct answer as it primarily functions to transmit signals between the brain and the rest of the body and is not directly involved in controlling the activities of internal organs.
Options 2 and 3, Cerebrum and Cerebellum, are not the correct answers as they are mainly involved in higher cognitive functions and motor coordination respectively, and do not have direct control over the activities of internal organs.
Therefore, the correct answer is option 4, Medulla Oblongata.