This passage uses Description as an organizational structure, because it uses specific details to describe the responsibility of a human computer. Though it does use a minor comparison between a human computer and a modern-day calculator, it is used as an additional description, making description the primary structure used.
Answer: If you are talking about something you did as being heroic persay, you are going to really stretch how heroic you were. Or if the story is sad, you might add details that are sad. Or if by chance someone has wronged you, you might use choice words that would "make that person feel bad."
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B, because there is quotations and you have to start a new line when someone else is talking.