Answer:
The significance of the case of United States v. Jacobsen (1984) concerning the Fourth Amendment was:
d) It addressed the exclusionary rule.
Step-by-step explanation:
United States v. Jacobsen is notable for addressing the exclusionary rule. The case clarified the principles of the exclusionary rule, specifically in situations where a private party conducts a search and then turns over evidence to law enforcement. The Court's decision in Jacobsen helped establish rules for whether the evidence obtained in such situations would be admissible in court or subject to exclusion.