Country W has banned importation of oranges from Country V

Country W has banned importation of oranges from Country V in order to protect Country W's orange growers. Since orange prices in Country W have risen since this ban was instituted, the ban is considered a success.

Which of the following, if true, would cast doubt on the conclusion above?

A) The demand for oranges in Country V has risen.
B) The demand for oranges in Country W has decreased.
C) A freeze in Country V damaged large portions of the orange crop.
D) The rise in Country W's orange prices will lead to a decline in sales of those oranges.
E) Orange growers no longer need to spend advertising money to convince consumers Country W produces superior oranges to Country V.