Answer: B) Conversational.
Explanation: The tone of a text or sentence is the author's or speaker's attitude towards the audience, the subject or even the characters of the text. There are many different kinds of tones, like: positive, negative, objective, sad, angry, etc. In the given excerpt we can see a casual conversation between two men about how difficult it is for them to write letters, this is an example of an excerpt with a conversational tone.