The answer is "stacks." That is the object of the phrase, and since a person is searching for something ON the shelf, they aren't searching for the shelf itself.
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Hi UWU ;)
D. I do believe, the main thesis is the whole point of the story and when you tell a story the listener should be able to feel like they were there.
Greetings!
The correct answers would be Computer, Internet, Electronic, and pretty much anything else that refers to something with being online, or the internet.
Hope this helps you!