The correct answer to this question is option E.
A preposition is a word or group of words used before a noun, pronoun, or noun phrase to show direction, time, place, location, or spatial relationships, or to introduce an object. We can't find an error in the sentence. 'Is essentially' agrees with the singular subject 'book'. 'Very well' is modifying the adjective 'documented'. The preposition 'of' is correctly combined with the relative pronoun 'what'. 'Each' is correctly combined with the preposition 'of'.Thus, option E is the correct choice.
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