Discussion
The tuned oscillator has excellent frequency stability because :
Answer: B
The tuned oscillator has excellent frequency stability because the change in phase is abrupt due to high Q.
In a parallel resonant circuit the impedance changes from inductive to capacitive as the frequency passes through resonance, and if Q is very high that phase change is abrupt. The oscillation can only occur at the frequency where the loop phase is right, so any small drift is pulled back and the frequency stays tightly fixed. The passage concludes that a tuned oscillator therefore has excellent stability.
The frequency of a tuned oscillator is set by L and C, not by R and C, so the first option describes the phase shift oscillator. The passage does not say the supply voltage is highly stable, and large stray capacitances would harm stability, not help it.
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