Answer:
The correct answer is letter "C": This is not plagiarism.
Step-by-step explanation:
Plagiarism is the act of taking someone else's work and make it appear as if it belongs to another party. It also implies paraphrasing words from an article or changing the order of some of the words to give it a genuine look. Plagiarism is considered a misdemeanor but can be penalized.
The student's version in the example is not plagiarism because the source from where the student takes the reference of the elaboration theory is mentioned:
They soon switched to a model based on the elaboration theory (Reigeluth, 1999).
Thus, the student is recognizing that the conclusion was taken from another resource. The rest of the student's paragraph is related to another field of study - videogames - making a unique version only relating the theory.