To reduce the danger to life and property posed by major earthquakes, scientists have been investigating several techniques for giving advance warning of dangerous earthquakes.  Since catfish swim erratically before earthquakes, some investigators have proposed monitoring catfish to predict dangerous earthquakes.

Which of the following, if true, most seriously undermines the usefulness of the proposal?

(A) In Japan, which is subject to frequent earthquakes, the behavior of catfish has long been associated with earthquakes.
(B) Mechanical methods for detecting earthquakes have not proved effective.
(C) Tremors lead to the release of hydrogen sulfide gas into water, thereby causing various fish and shellfish to behave erratically.
(D) Careful construction can reduce the dangers posed by earthquakes.
Even very slight, fleeting tremors cause catfish to swim erratically.
问题分析：A 说这种鱼的行为经常伴随着地震，怎么看怎么像支持，不像驳斥，杀。B 围绕的mechanical method谈的，文章是围绕那些鱼的方法来谈的，杀，C 围绕的various fish和shelfish这些鱼谈的，和原文的鱼不是同一种，范围上没有交集，杀。D 说construction的事情，和原文观测鱼的方法没有关系，杀。E 说其他东西也可以让catfish有这种行为，显然可以驳斥，留着。