All options are correct. Referencing sources is important for several reasons:
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Locating Sources: It allows your instructor and others to locate and review the sources you used for further study or verification.
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Context and Evidence: It provides context and supports your arguments with credible evidence, which strengthens your work.
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Attribution: It indicates which ideas or information you have borrowed, giving proper credit to the original authors and avoiding plagiarism.
Thus, proper referencing serves multiple essential functions in academic work.