Horror Movies and Science Fiction Stories Are Often Based on the Premise

Horror movies and science fiction stories are often based on the premise that one person's brain has been surgically removed and implanted in the body of another person. This would actually be impossible because

A) damage to the brain is almost always fatal.
B) if the corpus callosum is cut, the brain cannot function.
C) damage to neurons in the CNS is usually considered permanent.
D) the blood brain barriers would not protect against infection.