Answer:
Your answer should be D.
Explanation:
While C is important, it is not going to be helpful for your topic. Imagine yourself writing a story; you need a main idea. The main idea in your essay is "in what ways is sleep necessary to our health?" because the other choices are little. Overall, D is what controls the other ones. If you want a sleep essay, you need to add how sleeping is necessary for health.
D is your answer.
Hope this helps!
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