According to the passage, which of the following statement is not true about fairy stories?
选项：

A: Fairy tales may beneficially direct children's aggressive, destructive and sadistic impulses.
B: Children can often be greatly terrified when the fairy story is heard for the first time.
C: If children indulged his fantasies in fairy tales instead of being taught how to adapt to reality by studying history and mechanics the world should be full of madman.
D: Fairy tales are no more than stories about imaginary figures with magical powers which has nothing to do with external world.