Matching each item from List I with List II:
- A. Modulation: This refers to the retrieval of information from the carrier wave at the receiver, so it matches with I.
- B. Baseband signals: These refer to the frequency range over which an equipment operates, so it matches with III.
- C. Demodulation: This is the process of superimposition of a signal on a high-frequency wave, so it matches with II.
- D. Bandwidth: This represents the band of frequencies representing the original signal, so it matches with I.