【单选题】
A A.System B engine-driven pump hydraulic pressure drops below limits only when airborne
B B.System B engine-driven pump hydraulic pressure drops below limits only when airborne and when flaps are less than 5 but not up
C C.System B engine-driven pump hydraulic pressure drops below limits only when airborne and when flaps are less than 15 but not up
D D.System B engine-driven pump hydraulic pressure drops below limits only when airborne and when flaps are less than 5 but not up with landing gear positioned to UP.
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