What Is the Exclusionary Rule

What is the exclusionary rule?

A) It occurs when the government induces someone to commit a crime that he/she had no previous propensity to commit.
B) It may be used by persons who have not yet reached the age of majority.
C) It is specifically applicable when the defendant lacks the capacity to understand that his actions were wrong.
D) It prohibits the government from prosecuting the same defendant for the same crime after he/she has already stood trial for it.
E) It is a means to suppress evidence that was obtained illegally.