Discussion
Which observation supports the importance of transient growth?
Answer: B
Case studies almost always identify an upper level precursor arriving from upstream rather than a disturbance growing in place from infinitesimal amplitude, which is what transient development from a finite initial perturbation describes. Spontaneous appearance would favour the normal mode picture. Even spacing reflects the preferred wavelength but says nothing about the growth mechanism. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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