Discussion
Which component gives a clamper its memory of the peak?
Answer: A
The series capacitor charges to the offset needed and holds it, while the diode provides the fast path that sets that charge on the first peak. The load resistance sets how quickly the charge leaks away and hence the low-frequency limit, and the reference merely shifts the level at which clamping occurs. A circuit that has to remember something always contains a storage element, and identifying it is the quickest route to understanding how the circuit behaves over time.
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