Answer:
A
Step-by-step explanation:
If you really think of it, you can use process of elimination here, we know that everything that is in quotation marks or parenthesis or re-wording (paraphrasing) we know that it is not plagorism, the only one without quotations nor parenthesis or paraphrasing, is A, this is why A is an example of plagorising, no matter how small or how much you copy, you cannot copy an article into you're document, claiming that this was made all by you.
Cheers!