Answer:
C. This is not plagiarism
Step-by-step explanation:
The student's version is not plagiarism, because he didn't just copy the text from the original work without mentioning the author. He mentioned the author at the beginning of the passage as well as mentioned the year of publishing - Frick (1991) claims that systems, including both business systems, and educational systems, are actually very simple.
He didn't paraphrase the text and put it as his work, he cited the author's words, even mentioning the paragraphs where he had taken them from - The main idea is that systems "have parts that fit together to make a whole" (The nature of systems in education section, para. 1).
To prove my answer, there are needed definitions:
Word-for-Word plagiarism - a text or parts of a text are copied literally from the original work without mentioning the author. The missing quotation marks in the passages, or indention of an author.
Paraphrasing plagiarism - a text paraphrased in your own words without acknowledging the author.
I hope it helped you :)