Why is the first-person point of view limited

In other words, a first person point of view makes the narrator the eyewitness to the plot of the story. Using a first person point of view allows an author to dive much more deeply into the narrator's character, since the reader gets to hear the narrator's inner thoughts and experience the narrator's emotions.

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c is the answer because first she would blush to make the reader wonder why which they find out in the next line.