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[单选题]

Use the following data to answer Questions 53 through 57.
　　Austin Roberts believes that the mean price of houses in the area is greater than $145,000. A random sample of 36 houses in the area has a mean price of $149,750. The population standard deviation is $24,000, and Roberts wants to conduct a hypothesis test at a 1% level of significance.The appropriate alternative hypothesis is:

A.Ha:μ<$145,000.

B.Ha:μ≥$145,000.

C.Ha:μ>$145,000.

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