We can actually deduce here that the version that best uses a variety of sentence structures to enhance the flow and writing style of a story is: OD. Wanda was nervous because it was the last period of the day and she had been practicing her English presentation for days. Jake was called first to do his, before Jaime was, and then Sarah was. Wanda's fingers were twitching, since they were trying to calm her frazzled nerves. It was her turn, after everyone else went.
Sentence structure actually refers to the the organisation of a sentence. It talks about how a sentence is arranged to create flow and better understanding.
Thus, we can see that option D gives the version that best uses the sentence structure to enhance flow.
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