Discussion
Which condition picks the frequency out of the noise?
Answer: C
Oscillation grows only where the phase condition and the gain condition are satisfied at the same frequency, and the frequency-determining network arranges for that coincidence at one point. The amplifier is far broader, the non-linearity acts on amplitude, and the transient is broadband. It is the coincidence rather than either condition alone that selects, which is why a sharp phase characteristic gives a precisely defined frequency.
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