麻烦请教一道平行题

 The rise in the prosperity of England subsequent to 1840 can be attributed to the adoption of the policy of free trade, since economic conditions improved only when that policy had been implemented.

The reasoning in the above argument most closely parallels that in which one of the following?

A.      An exhaustive search of the marshes last year revealed no sign of marsh hawks, so it can be assumed that a similar search this year would reveal equally little sign of that kind of bird.

B.      Building a circular bypass around Plainfield probably helped the flow of local traffic in the town center, since a circular bypass road generally cuts a city’s through traffic markedly.

C.      Before the banks raised their interest rates, people on average incomes could almost afford a mortgage for an amount twice their salary. Hence the rate increase has now put mortgages beyond their reach.

D.     Since the improvement in the company’s profitability began to occur after the vice president’s new morale-building program was put in place, that program can be credited with the improved result.

E.      The extinction of the dinosaurs was brought about by an asteroid colliding with Earth, so their extinction could not have come before the collision

选D

这题把我绕晕，如何解这一题阿？思路是什么阿？
        我对这种的充分必要条件搞不清阿。

是不是the policy if free trade->the prosperity if England 和
            economic conditions-> policy had been implemented ?

对于平行题的解题法是什么阿？
            

谢谢大家了。

The reasoning of the two is that because A happened before B, the former caused the latter.

感谢二楼的解释

按照楼上的解释，他们都是先一个时间顺序得出因果关系的逻辑错误是吧。

不过还是有一点想不通（呵呵，我逻辑学的比较差）， 在做题遇到 Only when 到底是把它看成像only if 一样的“必要条件”, 还是把像本题一样看成一个先后的时间顺序标志阿？

economic conditions improved -->the adoption of the policy of free trade-->rise in the prosperity of England
        

那么直接的原因是经济环境好了，导致了英国的繁荣。（一件事物发生好转，导致另一件事物导致好转）

A：An exhaustive search of the marshes last year revealed no sign of marsh hawks, so it can be assumed that a similar search this year would reveal equally little sign of that kind of bird.

先发生的事物没有向好的地方发展，后发生的也没有变化

B：Building a circular bypass around Plainfield probably helped the flow of local traffic in the town center, since a circular bypass road generally cuts a city’s through traffic markedly.

前者，路切断城市的交通，P附近的建筑可以帮助交通人流。

这个也没有体现好的地方的发展（improve）

C:Before the banks raised their interest rates, people on average incomes could almost afford a mortgage for an amount twice their salary. Hence the rate increase has now put mortgages beyond their reach.

都两倍了，当然不是好的发展

D：Since the improvement in the company’s profitability began to occur after the vice president’s new morale-building program was put in place, that program can be credited with the improved result

公司利润提高，导致了工程提高了进度。前者的好的地方的发展，导致后者好的地方的发展

E：The extinction of the dinosaurs was brought about by an asteroid colliding with Earth, so their extinction could not have come before the collision

这个也无关与题目的总结

谢谢， 原来是这样解题的。我原来以为经济情况好和英国繁荣是一回事呢。

原来是：一件事物发生好转，导致另一件事物导致好转

我原来以为是A发生在B之前，所以A决定B