The two correct answers are:
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So they can anticipate what readers already know about the topic. - Understanding the knowledge level of the audience allows the writer to tailor their arguments, avoiding overly complex explanations or unnecessary background information.
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So they confirm arguments based on how readers currently feel about the topic. - Knowing the audience's feelings and beliefs enables the writer to create arguments that resonate more effectively, addressing potential biases and enhancing persuasion.
The other options, while they may have some relevance in certain contexts, do not capture the essential reasons for understanding the audience in an argumentative text.