The option among the answer choices that best summarizes Don Quixote's notion is "He decides he should live like a knight," as stated in option C.
Don Quixote is the famous character in Miguel de Cervantes's novel. He is a crazy man who has read too many novels about knights and who has convinced himself that he should become one as well.
As a matter of fact, that is what paragraph 4 explains, as we can see in the attached picture. Don Quixote has read so many stories that he had gone insane, now believing he is supposed to go around the world acting like a knight. He will find evil to fight against, damsels in distress to save, and gain fame and admiration as a reward.
However, none of that happens. Poor Don Quixote only sees those things in his mind. For example, he confuses windmills for gigantic monsters he has to defeat.
We can conclude option C is the right answer for this question about Don Quixote's notion.
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