An officer, with short and frequent whistle blasts, orders...
A)That movement be resumed.
B)That the vehicle be immobilized off the road.
C)That the vehicles to which they are directed stop.Correct
Short and frequent whistle blasts from a traffic officer order the immediate stopping of the vehicles to which they are directed. This acoustic signal is a direct order that prevails over any other signage. Conversely, a long blast indicates that movement may resume.