The correct answer is B. The Exclusionary Rule prevents evidence gained as the result of an illegal act by police from being used at the trial of the person from whom it was seized.
In the constitutional law of the United States, the Exclusionary Rule rule is a legal principle that holds that evidence collected or analyzed, contrary to the provisions of the Constitution of the United States are inadmissible before the court in a criminal proceeding, so they can not be used in a criminal trial.
The Exclusionary Rule was designed to remedy and discourage, in the criminal process, both the prosecutor and the police that illegally obtains evidence in violation of the Fourth and Fifth Amendments of the United States Constitution, which provide protection from unreasonable inquiries, apprehensions and self-incrimination.
The Exclusionary Rule applies to US citizens and foreigners (legal and illegal) who reside in the United States.