In Which of the Following Cases Will Criminal Liability Be

In which of the following cases will criminal liability be excused?

A) Jerry asks Tom for an aspirin and Tom handed him two pills.The pills were poisoned as Tom intended to kill Jerry.
B) If the law requires that you always carry a license,but the official issuing the license formally tells that you need not.
C) Jerry asks Tom for an aspirin and Tom handed him two pills.The pills were poisoned,but Tom believed that it would just make Jerry mildly unconscious.
D) The police use an undercover agent to sell drugs in order to catch the actual drug dealers.
E) A traffic policeman does not like his neighbor and asks a towing company to remove the neighbor's car on the basis of having being parked in a no-parking,while it actually was properly parked.