What does the term "critical engine out airspeed" refer to?

The term "critical engine out airspeed" specifically refers to the minimum speed required to maintain controlled flight when one engine is inoperative. This is a vital performance consideration for multi-engine aircraft, as it allows pilots to ensure that the aircraft can be controlled safely in the event of an engine failure.

At this speed, the aircraft can maintain straight flight, avoid excessive bank angles, and have sufficient control authority to handle any asymmetrical thrust that results from having one engine out. Knowing this airspeed is crucial for pilots during critical phases of flight, especially during takeoff and climb when engine-out scenarios are most likely to occur.

The other options do not accurately define "critical engine out airspeed," as they pertain to different operational speeds relating to takeoff, landing, and stall conditions rather than specifically addressing the situation of engine failure.