D. Plagiarism
Explanation - Plagiarism is the illegal use of the content of another writer without the citation. While writing a research paper, the author must make sure not to directly copy the content or data from the research papers.
If any idea is taken from other research paper then the citation or references should be given. There is a particular percentage of plagiarism allowed. Mostly it is not more than 10%. The manuscript will be rejected if the percentage of plagiarism is high.