What is the minimum speed for flap retraction after takeoff?

The minimum speed for flap retraction after takeoff in the CRJ 200 is V2 + 10 knots. This speed provides a safe margin above the takeoff safety speed, ensuring that the aircraft remains responsive and controllable during the critical phase of flight immediately after takeoff.

Retraction at this speed allows for sufficient lift and reduces drag, helping to maintain a stable climb while also accommodating any unforeseen issues, such as engine failure or required corrective actions. The additional speed beyond V2 ensures that the aircraft operates within safe aerodynamic parameters, promoting safety and effective climb performance as the flaps are retracted.

The other speeds indicated in the choices do not cater to the necessary safety buffer that V2 + 10 knots provides, which could compromise the aircraft's performance during this critical phase of flight.