Under which of the following situations would imposition of the death penalty most likely be justified in light of constitutional considerations?
(A)A defendant, a convict in prison, stabbed a prison guard to death and by statute is mandated to receive the death penalty.  (B)A defendant kidnapped and sexually assaulted a 12-year-old girl for a week before the defendant was arrested. (C)A defendant raped his victim and then savagely beat her with a baseball bat, causing her to suffer permanent brain damage.  (D)A defendant shot and killed a police officer during an attempted bank robbery.
D