Arnold is trying to understand the disagreement that occurs between Mr. and Mrs. Van Daan with regards the Mrs. Van Daan's fur coat. Which identifies the most useful question for Arnold to ask?
Rethorical devices are all those which helps an individual to argue successfully, defending his point of view but also convincing people to agree with his saying. That is why rethorical devices can help a student: he can explain himself better, defend his ideas and even convince others to do what he believes to be the best.
Expository writing traditionally serves the purpose of giving some sort of information. Either through describing, informing, or explaining the audience about a specific topic
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New York was visited by many people last year.