What technique can prevent the airplane from rolling during a stall?

Keeping the ball centered throughout the maneuver is crucial in preventing the airplane from rolling during a stall. This practice relates to the use of the aircraft's rudder to maintain coordinated flight. When an aircraft stalls, it can enter an uncoordinated state where one wing may stall before the other, leading to a roll toward the stalled wing. By using the rudder to keep the ball centered, the pilot can counteract any unwanted yaw that may cause rolling.

The technique also involves maintaining proper aileron control to ensure that the aircraft remains level. If the ball is not centered, the aircraft may yaw and roll, potentially leading to a more severe stall or a spin. Therefore, focusing on coordination through rudder use is essential during this critical phase of flight.

Other options pertain to actions that do not directly address the immediate cause of rolling during a stall. Lowering the nose can help recover from a stall, but it does not prevent the roll itself. Increasing engine power may assist with recovery, but it can also exacerbate the situation if applied incorrectly. Gradually raising altitude does not contribute to stall recovery or rolling prevention during a stall maneuver.