Final answer:
A letter is used as a form of argument to make a more personal and intimate appeal directly to another person.
Step-by-step explanation:
A letter is used as a form of argument to make a more personal and intimate appeal directly to another person. It enables the writer to express their thoughts, emotions, and persuasive arguments in a conversational manner. By addressing a specific recipient, a letter can establish a strong connection and evoke empathy.
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