From reading the text, we can see that the narrator finds the old man interesting because he thinks the old man is unique: he is different from the crowd, as shown in option D.
We can arrive at this answer because:
- The narrator of the story is watching a crowd and can categorize each person who makes up that crowd.
- He can tell what people are, what they are going to do, and why they are on the street.
- However, there is an old man in the crowd who is very difficult to categorize.
- The old man is different, unique, and intriguing. It doesn't resemble any kind of category that the narrator can think of and this stimulates the narrator's curiosity and fascination with the old man.
It's important to note that this question is about the short story "The Man of the Crowd" written by Edgar Alan Poe.
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