According to the Supreme Court Opinion in U

According to the Supreme Court opinion in U.S.v.Sharpe,concerning a determination of how long police officers can detain suspects during lawful stops:

A) a "bright line" rule of one hour is used to determine whether an investigative detention is reasonable.
B) Any stop more than twenty minutes,without an arrest,is unreasonable.
C) Officers can detain suspects,without arresting them,for twelve hours.
D) In evaluating whether an investigative stop is unreasonable,a flexible approach using common sense and ordinary experience must govern.