【单选题】
A A.An Altitude Warning Horn at 10,000 ft. At 14,000 ft (approximately) a 'Master Caution', plus an 'Overhead' indication on the light/glare shield will illuminate. The overhead panel will illuminate with 'PAX OXY ON' amber indications.
B B.An Altitude Warning Horn at 14,000 ft. The overhead panel will illuminate 'AUTOFAIL' and 'ALTN' amber indications on the pressurisation panel. These indications may be reset by selecting manual mode on the pressurisation selector.
C C.An Altitude Warning Horn at 10,000 ft. At 14,000 ft the Passenger Oxygen mask will deploy. To activate Oxygen flow to the Passengers the Crew must select the 'Passenger Oxygen Switch' to ON.
D D.An altitude warning buzzer at 10,000 ft. At 14,000 ft the oxygen masks will deploy and the overhead panel will show 'CREW OXY ON'.
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