How many feet is the minimum entry altitude for practice stalls?

The minimum entry altitude for practice stalls is correctly stated as 5,000 feet AGL (Above Ground Level). This altitude is established for safety reasons and to ensure that pilots have sufficient altitude to recover from any stall maneuvers without risking a mishap. At 5,000 feet AGL, there is adequate vertical space to perform the stall recovery procedures, which include regaining control and building airspeed before reaching a dangerously low altitude where recovery becomes more difficult or impossible.

Maintaining this altitude provides a buffer that enhances student learning and allows instructors to safely oversee the training without creating undue risk. The other options, while indicative of standard safety protocols in aviation, do not meet the regulatory minimum established for training purposes, emphasizing the importance of adhering to the defined altitude in practice.