The best and most correct answer among the choices provided by your question is the second choice.
He included the information to show that the Aulds are unique in their opposition to reading.
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What should the readers pay attention to is how the characters say, behave and feel in every line or how they were able to react in each scene or part. This will allow them to notice how the characters evolve or how they were able to develop in each scenario that is happening on the character's life as the story goes. For this is essential in reading a story or a book.
Extraneous means that something is irrelevant or something that has nothing to do with a particular subject. I hope this helps! :)