According to the Supreme Court's Opinion in U

Multiple Choice

According to the Supreme Court's opinion in U.S.v.Montoya de Hernandez,involving the detention of a traveler at the border,the standard of evidence necessary to detain a traveler at the border,beyond the scope of a routine custom search and inspection is:

A) probable cause.
B) no evidence at all,the Fourth Amendment does not apply at the border.
C) a clear indication of illegal activity.
D) reasonable suspicion.