Answer:
Elroy is a pretty mysterious old guy.
He is right there when O'Brien needs him, and he lets O'Brien make his own decision about whether to go to Vietnam or run to Canada without judging him or pushing him one way or the other. That's the only time he shows up in the book, though.
Explanation:
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A) A novel in which the novel itself is a main character.
A condensed summary compiling information about a particular field of knowledge is a compendium. The answer is option D. A compendium is a detailed and concise compilation of a body of knowledge. It can also serve as the compilation of the summary of larger works. The word compendium comes from the Latin word "compenso" meaning "to weigh together or balance".