The correct choice is B. It is reversible
Deep brain stimulation involves implanting electrodes within certain areas of your brain and caused new interest in surgical treatment of these disorders. It is used to treat different neurological conditions and is also being studied as a treatment for depression, addiction, dementia, and even stroke recovery.
On the other hand, psycho surgery has always been a controversial topic in the field of medicine. This was designed to treat psychological symptoms by means of brain surgery.