The expected drop in the price of cotton could
be a serious impact to agrarian nations and severely diminish the possibility to attain an economic growth rate above 10 percent.
(A) be a serious impact to agrarian nations and severely diminish the possibility to attain
(B) seriously impact on agrarian nations and severely impede the possibility to attain
(C) seriously impact on agrarian nations and severely impede the possibility of attaining
(D) have a serious impact on agrarian nations and severely diminish the possibility of attaining
(E) have a serious impact on agrarian nations and severely impede the possibility to attain
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A- ''could be a serious impact'' is idiomatically uncommon. the word ''impact'' is usually used with preposition ''on''.
B - both sides of the sentence are parallel, but there is a new word ''Impede'' - hold on that choice
C - in this context '' possibility of attaining'' fits best than ''possibility to attain''. Because, if we read the sentence with ''possibility to attain'' it may imply that '' Expected drop in X severely impede the possibility in order to (similar to ''to) attain an economic growth ...''. - illogic meaning.
D - option is grammatically correct and gives precise meaning without abovementioned mistakes.
E - it has the same error as in option C.
If we compare B to D, D uses word ''diminish'' in the question stem and therefore it does not change the intended meaning. Hence, D is our winner.
Hope, it helps.