What is the speed range referred to as slow flight?

Slow flight refers to a specific flight condition where the aircraft is operating at a speed that is above the stall speed but significantly below the cruise speed. This range allows the pilot to experience the aircraft's handling characteristics as it approaches the conditions of stall without actually entering a stall condition. It is crucial for pilots to practice slow flight since it helps them develop skills and awareness of the aircraft's performance limits.

In this specific context, the correct answer correctly identifies the speed between stall speed and best endurance speed. Best endurance speed is the speed at which an aircraft can maintain the longest flight time for a given amount of fuel, making it relevant when discussing slow flight. Understanding slow flight is vital for pilots to navigate safely in situations such as landing approaches, where precise control at lower speeds is necessary.

The other options don't accurately define the parameters of slow flight as understood within flight training. They either suggest speeds that are either below stall speed or above operational limits for best performance, which do not reflect the correct understanding of the slow flight regime.