What constitutes plagiarism and one strategy to avoid it?

What constitutes plagiarism and one strategy to avoid it?

• A. Copying someone else's work without attribution.
• B. A correct approach is to paraphrase without attribution.
• C. Plagiarism is presenting someone else's work as your own; avoid by citing sources and using quotation marks.
• D. Plagiarism can be avoided by ignoring the source entirely.

Answer: (C)