Which of the following, if true, most seriously weakens the argument? A. Many seaside resort communities where sharks have never been sighted nonetheless paid to install buried electrified cables. B. Tourism at resorts where sharks have been sighted has suffered only slightly despite the fact that many people claim to fear sharks. C. Because they have a strong fear of sharks, many tourists prefer to swim at beaches that are known to be well protected from sharks. D. The buried electrified cable is not the only innovation approved by environmentalists that is known to be successful in repelling sharks without harming them E. The marine mammals that are a major tourist attraction at many resorts do not enter areas around which there are buried electrified cables.