当两种商品X和Y的效用函数为U(X，Y)＝XY时，下列效用函数中描述了相同的...

单项选择题当两种商品X和Y的效用函数为U(X，Y)＝XY时，下列效用函数中描述了相同的偏好次序的是(    )。
   A．U＝(X-5)(Y-5)    B．U＝(X/5)(Y/5)
   C．U＝(X+5)(Y+5)    D．B和C都正确

A.U＝(X-5)(Y-5)
B.U＝(X/5)(Y/5)

C.U＝(X+5)(Y+5)

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