Welp, the kid appears to have pawned his work off on his friends, but who knows, if it's a multi-choice question I can't really help because you don't have the answers here.
Option 1 is not correct because the quote is no longer Mr. Cliff's wording. The last choice is also not correct because () should only be used if you need to make a letter capital or change the verb tense for the quote to make sense. [Brackets] are used when including clarifying information in quotations, and [high school students] is clarifying who "They" are. Answer B is correct.
The Answer Number Two Is Your Answer