If the material you use is not widely known, you must always cite it in your writing or study to avoid having it questioned.
Thus, Option D is correct.
If you make a personal knowledge reference, readers won't be able to look up the information and learn it for themselves.
Personal, unpublished information or experiences are therefore not cited according to APA standards.
For more information about research or writing refer to the link:
https://brainly.com/question/3939145
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