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What did the strict study generally find about the effect of internet use on sleep?

A. Teens who use the internet and phone after bedtime have a variety of sleep problems.

B. Sleep is unaffected by internet use, as long as it is on a personal computer.

C. Teens sleep better with their phone at their side.

D. younger teens tend to spend more time on internet devices.

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A. Teens who use the internet and phone after bedtime have a variety of sleep problems.

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