【单选题】
A A.A single controller failure when 'ALTN' light is also illuminated.
B B.Loss of AC power for more than 15 seconds; Main Outflow valve DC motor fails or if the cabin altitude exceeds 13,875 ft.
C C.Cabin Altitude exceeds 13,875 ft; pressurisation differential exceeds 8.65psi or with the loss of AC power.
D Cabin Altitude exceeds 10,000 ft.
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