I don't like the way this is worded. An allegory is a short type of poem. Not a genre. But the answer is D. If you look at general poetry structure, it tells a vivid story in a confined manner.
Wallace places emphasis on the word "adjust" because he is addressing our realities and way of thinking as "default." He expresses the importance of paying attention to your surroundings, and adjusting to other perspectives and ways of thinking. He compares our ignored experiences to the water fish swim in but were never taught to notice.
The answer is C because all the other answers are valid points if you have information to back it up
