Answer:
A person who has been uncaring or confused
The correct answer is B. A clause has a subject and a verb; a phrase does not. This is correct because any time a phrase has a verb added to it it becomes a clause. An example could be a noun phrase "The hardworking man". If you add a verb "sleeps" to it, it becomes a clause "The hardworking man sleeps".
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.