When unexpected turbulence occurs, what should flight attendants do immediately?

When unexpected turbulence occurs, the immediate priority for flight attendants is to ensure the safety of all passengers and crew on board. Stopping all in-flight service is essential because it helps prevent injuries that could arise from objects being moved or passengers being served while the aircraft is experiencing turbulence. Flight attendants are trained to prioritize passenger safety during turbulent conditions, which includes securing any loose items and ensuring that all passengers are seated with their seatbelts fastened.

While options like returning to assigned stations are critical actions for ensuring safety, the most immediate action needed when turbulence strikes is to halt service, as it directly addresses the potential for accidents and injuries. Continuing service or evacuating the plane are not appropriate responses during turbulence. Evacuations are typically a response to more severe emergencies, while continuing service could exacerbate risks associated with unexpected turbulence. Therefore, stopping all in-flight service is the correct response to maintain safety during such circumstances.