Last Year, During an Investigation of the Time Spent Reading

Last year, during an investigation of the time spent reading e-mails on a daily basis, researchers found that on Monday the average time was 50 minutes. Office workers claim that with the increased spam and junk mail, this time has now increased. To conduct a test, a sample of 25 employees is selected with the following results: sample mean = 51.05 minutes and sample standard deviation = 14.2 minutes. Assume times are normally distributed.
-How would you define the rejection region for this test at ? = .05?

A) t > 1.711
B) t > 2.33
C) t > 1.96 and t < -1.96
D) t > 3.646 and t < -3.646
E) t > 2.728 and t < -2.728