请教GWD22中一题逻辑题

hujing92

The cause of the wreck of the ship Edmund Fitzgeraid in a severe storm on lake Superior is still unknown , when the sunken wreckage of the vessel was round , searchers discovered the hull in two pieces lying close together , The storm's violent waves would have caused separate pieces floating even briefly on the surface to drift apart. Therefore, the breakup of the hull can be ruled out as the cause of the sinking.

Which of the following is an assumption on which the argument dipends?

A.Ships as large as the Edmund Fitzgerald rarely sink except in the most violent weather.
B.Under water currents at the time of the storm did not move the separated pieces of the hull together again .
C.Pieces of the hull would have sunk more quickly than the intact hull would have
D.The waves of the storm were not violent enough to have caused the breakup
E.If the ship broke up before sinking , the pieces of the hull would not have remained on the surface for very long

正确答案B
我用排除法选的B，但也不怎么明白B的意思

Yingmillie

正好我昨晚刚自己分析过这题
推理链：暴风会使hull分开漂浮---所以挨得很近的hull不是暴风造成的
  作者默认只要挨在一起绝不是暴风，也就是说暴风之后造成的frift apart不会受别的因素的影响会一直drift apart。所以assumption一定要说明，坚决排除一切可能使hull在一起的可能。
Reasoning
What must be true in order for the given premises to justify the conclusion that the broken hull did not sink the ship? The ship wrecked in a storm. If the hull was in separate pieces during the storm, the waves would have made the pieces drift apart. But the two pieces of the hull were found close together. Therefore, the argument concludes that the hull must not have been in separate pieces when the ship sank. This assumes that since the two pieces of the hull were found together, the storm waves never made them drift apart.
The correct answer is B
B：发生strom时水下的气流不会使已经separated的pieces 冲在一起（挨得很近）