【单选题】
A A.When System A pressure is low and the landing lever is positioned up
B B.When the ALTERNATE NOSE WHEEL Switch is positioned ON
C C.When the No.1 engine RPM drops below a limit value with the landing gear still down and the landing gear is positioned up
D D.After a failure of the No.1 engine hydraulic pump with the landing gear still down and the landing gear is positioned up
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