Discussion
Above the flutter speed, the amplitude of the oscillation
Answer: A
Flutter is a dynamic instability, so beyond the critical speed the amplitude grows and can destroy the structure within seconds. That is what makes it categorically different from a merely poorly damped mode, and why flutter clearance is demonstrated by careful expansion of the envelope rather than by exploration. A constant amplitude is the boundary case exactly at the flutter speed. Decay describes speeds below it. And it is self-excited, needing no continuing input.
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