Answer:
c. This is not plagiarism
Step-by-step explanation:
The student mentions the author when he says "Like Eistein before him, Hawkings has established..."
When yo cite or mention the author of the original text and you paraphrase what he is saying, is not plagiarism, because the reader knows where the author took the idea originally from.
In consequence, when citing the author, the student isn´t making plagiarism.