求教:GWD-9-Q14

The Eurasian ruffe, a fish species inadvertently
introduced into North America’s Great Lakes in
recent years, feeds on the eggs of lake whitefish, a native species, thus
threatening the lakes’ natural ecosystem. To help track the ruffe’s spread,
government agencies have produced wallet-sized cards about the ruffe. The cards
contain pictures of the ruffe and explain the danger they pose; the cards also
request anglers to report any ruffe they catch.

Which of the following, if true, would provide most
support for the prediction that the agencies’ action will have its intended
effect?

            A.     
The ruffe has spiny fins that make it unattractive as prey.

B.      
Ruffe generally feed at night, but most recreational
fishing on the Great Lakes is done during
daytime hours.

C.      Most people who fish recreationally on the Great Lakes are interested in the preservation of the
lake whitefish because it is a highly prized game fish.

D.      The ruffe is one of several nonnative species in the Great Lakes whose existence threatens the survival of
lake whitefish populations there.

E.      
The bait that most people use when fishing for whitefish on
the Great Lakes is not attractive to ruffe.

答案是C,請問C為什麼是對的?

D錯在哪?

謝謝

原来这样 我一开始以为是无关呢