C.) They believed in the great chain of being, which dictated social roles.
The correct answer is paraphrasing.
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Instead of saying word-from-word what the person has told them and repeating it, they are saying "basically..."
The author's purpose in writing this paragraph is to inform the reader of the reasons for the differences between editions given the fact that the Grimm brothers, specially the younger one, wanted to change and perfect the original tales in their style to a more suitable public regarding literature back then.
I think D is the correct answer. Hope this helps :)
