Including citation can help you give credit to the proper author.
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The importance of using a variety of sentence structures is to change up your writing. To make the reader engaged in what you have to say. If your sentence structure is weak and does not vary the reader might get bored. It also better shows your topic.
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Answer:
C Establish a cultural comparison for her argument about napping.
Explanation:
The author has tried to mention the custom of European napping. It is a mid day pause from the routine works to feel the individual fresh every day. The person can have a short break from his work and enjoy the time doing things that make him feel fresh again. The author has made comparison from the other countries who do not follow such rituals.