The following items require citation:
- D. Paraphrases from interviews you've personally conducted: Even if you conducted the interview and are paraphrasing the content, it is important to credit the source of the information.
The other options typically do not require citation:
- A. Totally original content: This is your own creation and does not need citation.
- B. Common knowledge: Information that is widely known and easily verifiable does not require citation.
- C. Your opinions: Personal opinions do not need citation unless they are based on someone else's work or ideas.
Thus, the answer is D.