During unexpected turbulence, what commands must flight attendants shout?

The correct response during unexpected turbulence is to shout commands that help ensure the safety of passengers. When flight attendants call out "Sit down" and "Fasten Seatbelts," they are providing clear, immediate instructions that emphasize the necessity for passengers to secure themselves in their seats. This helps to prevent injuries during sudden jolts or movements of the aircraft.

The phrase "Sit down" urges passengers to quickly take their seats and stop moving around the cabin, while "Fasten Seatbelts" reminds everyone to secure their seatbelts to minimize the risk of injury. This combination of commands effectively addresses the immediate safety concerns associated with turbulence.

In situations of turbulence, it's crucial that flight attendants communicate in a direct and informative manner, and these commands serve that purpose effectively. Other responses may not provide the same level of urgency or clarity needed during such an event. For example, simply telling passengers to "Hold on" or "Stay calm" may not provide the necessary instructions for safety, and "Brace for impact" is typically reserved for situations in preparation for a crash landing, which is a different context altogether. "Return to your seats" lacks the specific instruction to fasten seatbelts, which is crucial during turbulence.