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[单选题]

Use the following data to answer Questions 58 through 63.
　　An analyst is conducting a hypothesis test to determine if the mean time spent on investment research is different from three hours per day. The test is performed at the 5% level of significance and uses a random sample of 64 portfolio managers, where the mean time spent on research is found to be 2.5 hours. The population standard deviation is 5 hours.The analyst should most appropriately:

A.reject the null hypothesis.

B.fail to reject the null hypothesis.

C.reach no conclusion because the sample standard deviation was not given.

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