A random sample of 50 students at a large high school resulted in a 95 percent confidence interval for the mean number of hours of sleep per day of (6.73, 7.67). Which of the following statements best summarizes the meaning of this confidence interval? 
选项为:A:About 95\% of all random samples of 50 students from this population would result in a 95\% confidence interval of (6.73.7.67).  B:About 95\% of all random samples of 50 students from this population would result in a 95\% confidence interval that covered the population mean number of hours of sleep per day.  C:95\% of the students in the survey reported sleeping between 6.73 and 7.67 hours per day.  D:95\% of the students in this high school sleep between 6.73 and 7.67 hours per day.  E:A student selected at random from this population sleeps between 6.73 and 7.67 hours per day for 95\% of the time.  请回答其中一个选项.