PART A: Which statement best expresses the central idea of the text?
A. Researchers recommend that teenagers get between five and nine hours of sleep a night to protect them from deteriorating mental health.
B. Research is showing that lack of sleep probably increases the likelihood of mental health problems in teenagers.
C. While getting too little sleep can be damaging to teenagers, it is also not beneficial to get over nine hours of sleep.
D. Mental health problems negatively affect teens’ sleep patterns, more than lack of sleep contributes to mental health problems