Your answer is tone. It is asking about the author's "attitude" toward the topic or subject. tone is <span>the general character or attitude of a place, piece of writing, situation, etc. In this case it is toward the topic or subject of the book.</span>
Answer:
It is a preposition.
Explanation:
A preposition is a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause, as in “the man on the platform,” “she arrived after dinner,” “what did you do it for ?”
An adverb is a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. (e.g., gently, quite, then, there ).
Hope this helps : )
