In sentence 10 (reproduced below), the writer wants to use evidence to strengthen the connection between school schedules and teen sleep deprivation.The Centers for Disease Control has found that the earlier school begins, the less sleep teens receive.

Choice B directly links early school start times to teen sleep deprivation: it says that because of these times, almost 70 percent of teens get less than seven hours of sleep. That statistic strengthens the connection by showing how widespread insufficient sleep is. Choice C discusses when students wake up but does not provide evidence about how much sleep they get.

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