Which brain structure regulates the sympathetic and parasympathetic branches of the autonomic nervous system? the amygdala the hippocampus the thalamus the hypothalamus?

The answer would be the hypothalamus. The hypothalamus is composed of the Automatic Nervous System wherein it controls our bodily functions and involuntary movements caused by our subconscious part of the brain. It is also the primary system that enables our fight or flight response.