The answer is a the first sentence is dialogue and the second sentence shows action
A) varied
Varied/variety means there's many, which is said in the next sentence.
Mr. O'Brien and Winston are the principals starrings of the novel.
Textually O'Brien tells Winston: The first thing you must realize is that power is collective. The individual only has power in so far as he ceases to be an individual..alone...free.. the human being is always defeated.
That is the first thing from O'Brien to Winston.
It usually appears as an individual section called Reference.
It locates at the end of the essay, and they are labeled correspondingly with notice in the previous sections as well.