有一道想不明白的逻辑题，请大家指教！！

A survey was recently conducted among ferry passengers on
the North Sea. Among the results was this: more of those
who had taken anti-seasickness medication before their trip reported symptoms
of seasickness than those who had not taken such medication. It is clear, then
that despite claims by drug companies that clinical tests show the contrary,
people would be better off not taking anti-seasickness medications.

Which one of the following, if true, would most weaken the
conclusion above?

(A) Given rough enough weather,
most ferry passengers will have some symptoms of seasickness.

(B) The clinical tests reported
by the drug companies were conducted by the drug companies’ staffs.

(C) People who do not take
anti-seasickness medication are just as likely to respond to a survey on
seasickness as people who do.

(D) The seasickness symptoms of
the people who took anti-seasickness medication would have been more severe had
they not taken the medication.（D）

(E) People who have spent money
on anti-seasickness medication are less likely to admit symptoms of seasickness
than those who have not.