When should the exit row passengers acknowledge their roles?

The correct answer is that exit row passengers should acknowledge their roles during safety demonstrations. This timing is crucial because the safety demonstrations are specifically designed to inform passengers about safety procedures, including the responsibilities of exit row occupants. During this time, crew members clearly outline the roles of exit row passengers, ensuring they understand what is expected of them in case of an emergency.

This acknowledgment serves to confirm that those passengers are aware of their responsibilities and capable of performing them when necessary, contributing to the overall safety of the flight. By addressing this during the safety demonstration, the crew can ensure that passengers are attentive and have the opportunity to ask questions or voice any concerns they may have about their duties.

The other options either miss the immediate opportunity for engagement during the safety demonstration or do not align with guidelines for passenger accountability and awareness in emergency situations. For instance, waiting until after takeoff does not allow for passengers to ask questions or familiarize themselves with the procedures. Similarly, acknowledging responsibilities at the point of boarding or before landing is not optimal because safety procedures should be proactive rather than reactive.