How can a flight attendant ensure passenger safety during turbulence?

A flight attendant can ensure passenger safety during turbulence by informing passengers to sit down and fasten their seatbelts. This is crucial because turbulence can cause sudden and unexpected movements of the aircraft, which may lead to injury if passengers are not securely seated. By emphasizing the importance of wearing seatbelts, flight attendants help to minimize the risk of harm to passengers, ensuring their safety during such conditions.

Engaging in other actions, such as providing entertainment or asking for feedback, would not address the immediate safety concerns and could lead to situations where passengers are at increased risk of injury. Ignoring passengers during turbulence is also not an appropriate response, as it fails to communicate the critical need for safety measures during potentially dangerous situations.