Answer: D. Because it is written by one person and directed at another person instead of a general audience.
Explanation: A letter is a written or printed communication addressed to a person or organization and usually transmitted by mail. A letter is considered a more intimate form of making an argument because it is usually written by one person and directed at another person instead of a general audience, this helps to create a more personal tone and to eliminate the barrier between the writer and the reader, which makes it more intimate.
