Which condition could potentially lead to a stall if not properly managed during flight?

High drag configuration can significantly reduce the aircraft's speed and increase the risk of a stall if not managed properly. When an aircraft is in a configuration that produces excessive drag, such as deploying flaps or landing gear for a landing approach, it requires additional lift to maintain flight. If the airspeed drops below the aircraft's critical stall speed in this configuration, the wings may not produce enough lift to counteract the weight of the aircraft, resulting in a stall.

In contrast, excessive altitude itself does not directly cause a stall but rather affects air density and engine performance. Extreme weather conditions can pose various flight challenges but are more associated with turbulence or structural stress than with a stall specifically. A stable air mass is typically favorable for flying and would not lead to a higher stall risk; rather, it tends to indicate smoother conditions. Therefore, high drag configuration is the correct answer as it directly relates to stall risk management during flight.