Discussion
The service ceiling of an airplane is the altitude
Answer: D
The service ceiling is the altitude at which the maximum rate of climb is 100 ft/min.
The maximum rate of climb falls as altitude increases because excess power shrinks. The altitude where it reaches zero is the absolute ceiling, the theoretical limit of sustained level flight. Because that limit is approached only asymptotically, a practical ceiling is defined where the airplane can still climb at 100 ft/min (about 0.5 m/s).
"Beyond which the airplane cannot sustain level flight" describes the absolute ceiling. 100 m/min is about 330 ft/min, the wrong standard. The altitude for maximum power required is not a ceiling definition at all.
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