An airplane lifts off and leaves ground effect. What must the pilot do to keep the same lift coefficient?

1. 1Decrease the angle of attack
2. 2Increase the angle of attack
3. 3Retract the landing gear at once
4. 4Reduce the weight

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 5: Aerodynamics of Flight — Ground Effect, page 109