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Rearrange the following parts to form a meaningful sentence:

(A) the blue light emitted thereof increases cortisol levels and reduces melatonin, which is why

(B) a Harvard research shows that anxiety about staying connected can disrupt sleep, as

(C) the National Sleep Foundation advises turning off all electronic devices before bed

(D) people who worry about staying informed use electronic devices right up until bedtime, and

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 2

Option 1 -> Starts with advice (C) before establishing the problem - illogical flow.

Option 2 -> Flows logically: research finding (B) → behavioral pattern (D) → scientific explanation (A) → practical advice (C). All connectors work perfectly.

Option 3 -> Places (D) awkwardly after (C), breaking the logical sequence.

Option 4 -> Ends with "which is why" without completing the thought - grammatically incomplete.


Hence, Option 2: (B), (D), (A), (C) -> This arrangement creates a coherent sentence that flows from Harvard research about anxiety disrupting sleep, to explaining how people use devices until bedtime, to the scientific reason (blue light affecting cortisol and melatonin), concluding with the National Sleep Foundation's advice. The connecting words "as," "and," and "which is why" link each segment seamlessly. -> correct

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