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 ves-

sel 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 depends?

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 sepa-

rated 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

E) If the ship broke up before sinking , the pieces of the hull would not

have remained on the surface for very long

   D选项不完整,请问这题有答案吗?  Thanx a lot~