Answer:
I think it's the last one, "It moves the plot forward without the narrator describing every event". :)
Hi, it is A. Hope I helped!
While Padmi looks frantically for her pen, her sister calmly writes with it. "While Padmi looks frantically for her pen," cannot stand alone. Using it in "While Padmi looks frantically for her pen, her sister calmly writes with it." makes it dependent on the second part of the sentence.
The answer for sure is the first two
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