Final answer:
A humorous essay about attending a concert would be most likely to be written with a conversational tone.
Step-by-step explanation:
The choice that would be most likely to be written with a conversational tone is A. a humorous essay about attending a concert. In a conversational tone, the writing style is more casual, informal, and relaxed, often resembling spoken language. A humorous essay about attending a concert would likely involve storytelling, personal anecdotes, and a casual tone to engage and entertain the reader.