Passing 3000' climbing, you have selected Engine Anti-Ice ON. Passing FL90, you select them OFF.
A.A.Stall warning logic, airspeed indications and minimum maneuver speeds on the airspeed indicator return to normal.
B.B.Stall warning logic and minimum maneuver speeds on the airspeed indicator return to normal.
C.C.Stall warning logic, airspeed indications and minimum maneuver speeds on the airspeed indicator return to normal, if wing anti-ice has not been used in flight.
D.D.Stall warning logic and minimum maneuver speeds on the airspeed indicator return to normal, if wing anti-ice has not been used for takeoff.
正确答案是C