Discussion
What happens to a cascade's low-frequency limit as stages are added?
Answer: C
Exactly as at the high end, each stage's low-frequency roll-off adds to the others, so the combined 3 dB point moves upward and the useful band narrows from both sides. Total capacitance is not a meaningful sum here, and the limit is certainly not set by one stage alone. The symmetry between the two ends is worth noticing: compounding narrows the passband at whichever end the roll-offs occur.
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