Answer:
D. A direct quotation that is marked off by quotation marks
Explanation:
Quotation marks are responsible for indicating that some texts are explicitly referenced in a paper with no changes made. This type of quote must be very well referenced in the paper, both on lines where the quotes are written with author's surname, date of publishing, page referenced, and also on the bibliography at the end of the paper with all these references very well detailed, including text's title, translators (if any), number of editions, publishing house, and more. It is important to highlight it depends on the policies of publishing the paper must follow because there are different patterns for referencing and quoting.
