Which of the following best expresses the author’s main purpose in this document?

Explanation:

I could not find the document that is missing in your question but I will tell you some information that can help you in your question.

First of all, we must recognize which type of document is about. It could be technical document, scientific, law document and more. Purposes of documents can be to provide some sort of information to audience and readers, to persuade the ones who are reading or listening, to prohibit some information or to simply provide information that are important.

Some documents should describe the usage of something or operation which is important.

ill check : )

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in my opinion, ap calculus was the most difficult. i often struggled with it a lot. however, i have gotten a lot better.