Despite Being in an Irreversible Coma, Karen Ann Quinlan Was

Despite being in an irreversible coma, Karen Ann Quinlan was not considered to be totally brain dead because

A) it was likely that she would regain consciousness at some time in the future.
B) she continued to show significant activity in her cerebral cortex.
C) her condition was due to an environmental accident (drug use) not a natural biological process (e.g., cancer) .
D) she continued to breathe even after being taken off of a respirator.