OG12 CR 75求高人指点啊！！

75.An overly centralized economy, not the changes in
the climate, is responsible for the poor agricultural
production in Country X since its new government
came to power. Neighboring Country Y has
experienced the same climatic conditions, but
while agricultural production has been falling in
Country X, it has been rising in Country Y.

Which of the following, if true, would most weaken the
argument above?
(A)Industrial production also is declining in
Country X.

(B)Whereas Country Y is landlocked, Country X has
a major seaport.

(C)Both Country X and Country Y have been
experiencing drought conditions.

(D)The crops that have always been grown in
Country X are different from those that have
always been grown in Country Y.

(E)Country X's new government instituted a
centralized economy with the intention of
ensuring an equitable distribution of goods.

答案为何是D啊？