On a Hot Summer Day, an Off-Duty Detective Is Having

Multiple Choice

On a hot summer day, an off-duty detective is having lunch in an Italian bistro in Las Vegas. He looks out the window of the restaurant and sees a man in long sleeved clothing walking back and forth in front of a bank across the street. The man appears to be constantly peering inside the bank's window and is checking his watch regularly. The officer decides to investigate. He walks across the street and confronts the man, asking him to explain what he is doing and to show ID. Unsatisfied with the man's evasive answers, the officer asks the suspect to raise his arms to the side and pats the man down. After feeling what he thinks is a gun, the officer reaches in the man's coat pocket. There, the officer finds a 9mm handgun and a small bag of cocaine.
-Based on the Supreme Court's decision in Hiibel v. Nevada, the request for an ID is:

A) Permissible but only if there was probable cause.
B) improper under all circumstances.
C) permissible if there was reasonable suspicion.
D) permissible under any circumstances.