People in the tourist industry know that excessive development of seaside areas by the industry damages the environment. Such development also hurts the tourist industry by making these areas unattractive to tourists, a fact of which people in the tourist industry are well aware. People in the tourist industry would never knowingly do anything to damage the industry. Therefore, they would never knowingly damage the seaside environment and people who are concerned about damage to the seaside environment thus have nothing to fear from the tourist industry.
The reasoning in the arguments is most vulnerable to:
(A) No support is provided for the claim that excessive development hurts the tourist industry.(even if support is provided for the claim, doesn't make the argument vulnerable)
(B) That something is not the cause of a problem is used as evidence that it never coexists with that problem.( argument suggests that excessive development causes the damage to the environment, but people would never knowingly damage the seaside environment)
(C) The argument shifts from applying a characteristic to a few members of a group to applying the characteristic to all members of that group.( No, it talks about people is tourist industry)
(D) The possibility that the tourist industry would unintentionally harm the environment is ignored.( Yes, argument is vulnerable to this possibility,because argument clearly says that people in tourist industry wound not knowingly damage the the industry, but they may unknowingly damage the industry)
(E) The argument establishes that a certain state of affairs is likely and then treats that as evidence that the state of affairs is inevitable.( No)
Will go with choice D
Thanks