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Which of the following statements support the main idea in “recent study shows that blue led lights effect sleep”

User Phuongle
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It definitely won't be B. I don't have the text with me, unfortunately, I'm sure it was a print-out; but judging by the title alone, I think we can infer that C and A were also not main ideas. Therefore, the answer would have to be D. Please correct me if I'm wrong, since you have the text with you. C is also a possibility. How often does the author mention C? Is it a point that they come back to multiple times? Is it mentioned in both the introduction, and the conclusion? All of these things point to main idea.
User Konrad Kostrzewa
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