Which of the following represents plagiarism?

Plagiarism is fundamentally about misrepresenting the origins of ideas, words, or findings by presenting them as one's own. The correct answer captures this definition perfectly. When an individual presents someone else's ideas or words without appropriate attribution, they are effectively taking credit for that work, which is a clear violation of ethical standards in research and academia.

This act of claiming another's intellectual property as one’s own undermines the integrity of scholarship and the trustworthiness of the research community. It prevents the original creator from receiving appropriate recognition and can also mislead others about who is responsible for specific contributions within a field.

While other options involve unethical practices, they do not directly align with the definition of plagiarism. Selectively presenting data supports biased interpretations but doesn't involve misrepresenting authorship or ideas. Listing someone as an author without their contribution is considered authorship misconduct, rather than plagiarism. Similarly, failing to report all study conditions pertains to transparency in research and can affect data integrity, but it does not constitute plagiarism.