Which of the Following Scenarios Constitutes the Tort of Assault

Which of the following scenarios constitutes the tort of assault?

A) Jasper threatens to shoot Rupert with a toy gun.Rupert doesn't know that the gun is a toy.
B) Jasper raises his fist at Rupert and says, 'If I was a violent man I would punch you in the face.'
C) Jasper points a shotgun at Rupert from outside his closed window.Rupert knows the window is bulletproof glass and he is in no danger.
D) Jasper threatens to stab Rupert with a knife.Rupert knows that the knife is made of rubber.