What phrase should be added to a list that helps fifth-grade students remember when to cite sources?

The phrase about including reproductions of photographs or illustrations from a website is appropriate for helping fifth-grade students understand when to cite sources because it emphasizes the importance of giving credit for visual content that is not their own. In academic and creative settings, using images or art created by others necessitates proper citation to acknowledge the original creator's rights and to provide context for the audience. This aligns with the broader principle of academic integrity, which is crucial for students to learn at this level.

In contrast, the other options involve scenarios where the information is either original work (like conducting personal scientific experiments), widely accepted facts (factual information), or oral traditions like folktales that may not have a clear attribution to a specific author. While these scenarios may also have their own citation considerations, they do not directly highlight the necessity of citation for creative visual materials, making the first option the most relevant for this specific context about citing sources.