For which information must you cite your source in a research paper? A. original ideas that are not your own B. your own original ideas C. personal observations you have made D. general facts that anyone would know

The answer would be the first choice or A. "Original ideas that are not your own."

Any piece of information that does not belong to you would require a citation, otherwise it would be considered plagiarism. B and C are incorrect because both of those things belong to you, and therefore don't require citation. D is also incorrect because a general fact doesn't belong to any one person. For example, if you wanted to include the information that dogs can't eat chocolate, that wouldn't require a citation because that is general knowledge that most people are aware of.