请教prep logic

gmatziyu

Twelve years ago andagain five years ago, there were extended periods when the Darfir Republic'scurrency, the pundra, was weak:  itsvalue was unusually low relative to the world's most stable currencies.  Both times a weak pundra made Darfir'smanufactured products a bargain on world markets, and Darfir's exports were upsubstantially.  Now some politicians aresaying that, in order to cause another similarly sized increase in exports, thegovernment should allow the pundra to become weak again.

Which of thefollowing, if true, provides the government with the strongest grounds to doubtthat the politicians' recommendation, if followed, will achieve its aim?

(A) Several of thepoliticians now recommending that the pundra be allowed to become weak madethat same recommendation before each of the last two periods of currencyweakness.
(B) After severaldecades of operating well below peak capacity, Darfir's manufacturing sector isnow operating at near-peak levels.
(C) The economy of acountry experiencing a rise in exports will become healthier only if thecountry's currency is strong or the rise in exports is significant.


(D) Those countrieswhose manufactured products compete with Darfir's on the world market allcurrently have stable currencies.
(E) A sharpimprovement in the efficiency of Darfir's manufacturing plants would makeDarfir's products a bargain on world markets even without any weakening of thepundra relative to other currencies.
答案为什么是B，而不是E呢？谢谢

dphxmg

E) provides an alternative method of increasing export, but does not cast any doubt on the effectiveness of weakening Darfir's currency in achieving the same goal.

B) means that Darfir may not have enough capacity to meet the increased need for Darfir's products triggered by a weak Darfir currency.

gmatziyu