The answer is A. To go in
Books that are surrounded by oxygen will turn yellow, so basically, all books since oxygen is constantly surrounding us. Oxygen-rich conditions are very bad for paper, which gives them the yellow tiny. This is actually called lignin oxidation! Lignin oxidation gives it a yellow or brown colour as you said. Yellow comes first, then brown after.
I hope this helped a bit! :)
Answer:
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do you know vriska i think shes soooooo cute
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i would wear a white coat and bring a physical map and a compass I would aslo bring a phone a charger incase i find power somewhere.for food i would bring nonparish able foods and a refillable water bottle i would use a backpack bc it never said i couldint it just said suitcase and i would wear thick boots would try to find a bunker somewhere and bring one or two extra pairs of clothes