Answer:
D.
Step-by-step explanation:
Option D best uses a variety of sentence structures to enhance the flow and writing style of a story because it combines both simple and complex sentences. The simple sentence structure in the first sentence, "Though the road was bumpy, the caravan drove on," sets a clear and concise tone for the following sentences. The compound sentence structure in the next sentence, "Passengers stared out their windows. It was a long way down," adds variety and flow to the writing. The complex sentence structure in the final two sentences, "and some of them were afraid. They thought the route was too dangerous," creates a sense of emphasis and provides a conclusion to the description of the scene. Overall, the combination of sentence structures in Option D creates a smooth and dynamic flow to the writing.