题目内容
(请给出正确答案)
[单选题]
A shift to the left of the demand curve for X together with a shift to the right of t
A.increase the price of X; the effect upon the quantity exchanged is indeterminate
B.increase the price of X and to increase the quantity exchanged
C.decrease the price of X and to decrease the quantity exchanged
D.decrease the price of X; the effect upon quantity exchanged is indeterminate
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