A hypothesis test in which n = 250 is set up so that P (rejecting H\textsubscript{0}, when H\textsubscript{0~}is true) = 0.05. Which of the following is true? 
选项为:A:We can increase the power if we let alpha = 0.05.  B:We can increase the power if we let alpha = 0.01.  C:We can increase the power if we let n = 200.  D:We can decrease the power if we let n = 200.  E:We can decrease the power if we let n = 300.  请回答其中一个选项.