The entry door can be at risk if left open in winds exceeding:

The correct answer identifies a threshold of wind speed where safety becomes a significant concern regarding the entry door. When wind speeds reach 65 knots, the force exerted by the wind can create substantial risk. An open entry door can be violently forced back, potentially leading to damage to the door itself, injury to personnel, or compromise of the aircraft's structural integrity.

Understanding this wind threshold is vital for maintaining safety protocols during operations, as it helps crew members make informed decisions about securing doors in adverse weather conditions. Recognizing the risks associated with high wind speeds is part of effective operational safety and risk management in aviation.