gwd 一题求助逻辑思路

dpzixuan89

in1992 outlaw fishing boats began illegally harvesting lobsters from the territorial waters of the country of B. soon after, the annual tonnage of lobster legally harvested in B waters began declining; in 1996, despite there being no reduction in the level of local lobster fishing activity, the local catch was 9000 tons below pre-1992 levels. it is therefore highly likely that the outlaw fishing boats harvested about 9000 tons of lobster illegally that year.
which of the following is an assumption on which the argument depends?
A the illegal lobster harvesting was not so extensive that the population of catchable lobsters in B's territorial waters had sharply declined by 1996.
B the average annual lobster catch, in tons, of an outlaw fishing boat has increased steadily since 1992.
C outlaw fishing boats do not, as a group, harvest more lobsters than do licensed lobster-fishing boats.
D the annual legal lobster harvest in B in1996 was not significantly less than 9000 tons.
E a significantly proportion of B's operators of licensed lobster-fishing boats went out of business between 1992 and 1996.

我选的B 答案是A

wangsiwei

我试试看哈。
中心是： outlaw fishing boats harvesting 导致 local catch decline
assumption 就是去掉别的引起decline的可能。只有A
B－ 文章没有涉及average annual lobster catch, 无关
C－ 文章没有两个之间的比较，无关
D，E 更是无关