Answer:
a is the right use of 'weather."
The answer would be because it uses a direct quotation from the author of the source used.
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! :)
A more positive word for argument is discussion
I don’t know there’s no article
