This is just like the Hare and the Turtle...... I believe the answer is B).
I think an informal writing style helps the reader to have a vivid, mental thinking about the writing, and it helps the reader to think about the question without stating it like you have to find the themes in an essays or writing.
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Im going with 3 because out of all the statements it describes that dark chocolate is good for someone
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Yes, maybe compare capitals or large cities. You still want to have enough information findable, but Australia and England are both very large, and I consider it too broad.