Writer's journals are mainly used for "It's used so the author can write down any idea he has for a book." <span>Any time the writer has an idea for a plot, character, conversation, name, event, description, etc. He <span>or she can write it down and refer to it later when she wants to make a story.</span>
Hope this helps!
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It would be C. because A. is just saying something, B. is asking a question, and D. is just declaring something, like "i just ate a yogurt"