Answer:
a. United States v. Salerno
Explanation:
The case between "United States v. Salerno" which was heard in the hear 1987 is one of the landmark case in the United States of America. In the case of United States v. Salerno, an important decision was taken in which the court make the Bail Reform Act of 1984, constitutional. According to it, the court can detain a person who is arrested, before the trail, if the government proves that the accused is a threat or dangerous to the society.
Thus the answer is --
a. United States v. Salerno