答案及解析：[单选题]Lack of sleep causes poor academic performance and health issues. ______ show that starting no earli - 语言文学类题库- 答案窝(daanwo.com)-大学生作业答案及考资分享平台

问题：

[单选题]Lack of sleep causes poor academic performance and health issues. ______ show that starting no earlier than 8:30 is recommended, yet only 14 percent of public high schools actually follow that guideline.
ANumbers
BResults
CStatistics