Which statement best expresses the central idea of the text?

A. Teenagers require a unique amount of sleep to fully function, which depends on their specific age and the individual demands of their body.

D. Sleeping for 8-10 hours a night supports teenagers’ mental development and guarantees that teens perform better in school.

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D. Sleeping for 8-10 hours a night supports teenagers’ mental development and guarantees that teens perform better in school.

Explanation:

Answer D gives the information relative to the central idea of the text (teenager's sleep). Answer A is very vague and just states that they have a special sleeping pattern that helps something. Answer D is more specific and gives just how many hours a teen needs and why/how it helps.