The correct option is B Medulla oblongata
The medulla oblongata is the mass of cells in the hindbrain. It functions to control involuntary actions such as vomiting, sneezing, breathing rate, heart rate, digestion, etc. Hypothalamus works to control the body temperature, thirst, hunger, sleep etc., thalamus works to control consciousness, sleep, sensory interpretation, etc., and cerebellum functions in speech, body posture, voluntary movements, coordination, etc. Thus, the correct answer is option C.