Which of the Following Individuals Is Most Likely to Benefit

Which of the following individuals is most likely to benefit from electroconvulsive therapy?

A) Mark,who feels so depressed that he recently tried to commit suicide
B) Mary,who suffers from amnesia and has lost her sense of identity
C) Jim,who experiences visual hallucinations and suffers from a delusion that enemy spies are following him
D) Luke,who suffers from a compulsion to wash his hands at least once every 15 minutes