Why, in Constructing His TICKING TIME BOMB Argument, Does Henry

Why, in constructing his TICKING TIME BOMB argument, does Henry Shue describe a case that even he regards as unrealistic?

A) Shue wants to show that although the consequences of torture could conceivably make torture permissible in some circumstances, those circumstances would have to be unrealistic.
B) Shue believes that such extreme cases bring out strong reactions that help us see our truest moral convictions.
C) Shue is simply trying to be dramatic to make his topic interesting.
D) Shue wants to establish that torture is permissible in principle as a way of arguing that it is permissible in less extreme cases.