求教PERP上的一道题

原文如下,请各方高人指点

Twelve years age and again five years ago, there were extended periods when the Darfir Republic 's currency, the Pundra, was weak, its value unusually low relative to the word's most stable currencies. Both times a weak pundra made Darfir's manufactured products a bargain om world markets, and Darfir's expors were uo substantially, Now some politicians are saying that, in order to cause another similarly sized increase in expors, the government should allow the pundra to become weak again.

Which of the following, if true, provides the government with strongest grounds to doubt that the polician's recommendations, if followed, will achieve its aim?

(A) Several of the politicians now recommending that the pundra be allowed to become weak made that same recommendation before each of the last two periods of currency weakness.

(B) After several decades of operating well below peak capacity, Darfir's manufacturing sector is now operating at near-peak levels.

(C) The economy of a country experiencing a rise in exports will become healthier only if the country's currency is strong or the rise in exports is significant.

(D) Those countries whose manufactured products compete with Darfir's on the world market all currently have stable currencies.

(E) A sharp improvement in the efficiency of Darfir's manufacturing plants would make Darfir's products a bargain on world markets even without any weakening of the pundra relative to other currencies.

我选了E,但是答案说是B.我想不通啊~~E 有什么不对类?

e也许能够刺激export, 但是在这里是无关的.

文章的结论是通过贬值来刺激export, 而不是别的什么办法. 我们要去weaken的也就是这里

那B的意思就是不用贬值也可以刺激出口咯?