What clues should you look for to determine if an author's purpose is to persuade?

Opinions.

Explanation:

The clues that one should look for is opinions reflected in the work to determine that if the author's purpose is to persuade. Some often call it questioning but the questions raised by the author in the text exemplifies the author's purpose to enforce the readers to think deeply. If the opinions and perceptions reflected in the text are in consideration with the majority, then the author's purpose might be to persuade the audience by inflicting these opinions in order to please them. For Example: we often witness in political speeches by the politicians where they talk about the ideas that are already trending among the people.

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1, 4, and 5 are all conflicts