Answer:
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Because Sarah made a wrong turn one to many times she was late for her party. The party was supposed to start at seven o'clock, but Sarah didn't make it until after eight, she knew that everyone was waiting for her but she couldn't get there any faster.
I believe the answer is "C. an explanation of the natural world" because it's giving an explanation as to why the moon "moves" across the sky.
A. It allows you to inform your readers about key elements in the piece. Hope this helps