补充材料146

    For a trade embargo against a particular country to succeed, a high degree of both international accord and ability to prevent goods from entering or leaving that country must be sustained. A total blockade of Patria's ports is necessary to an embargo, but such an action would be likely to cause international discord over the embargo.
The claims above, if true, most strongly support which of the following conclusions?
(A) The balance of opinion is likely to favor Patria ‍in the event of a blockade.
(B) As long as international opinion is unanimously ‍against Patria, a trade embargo is likely to ‍succeed.
(C) A naval blockade of Patria's ports would ensure ‍that no goods enter or leave Patria.
(D) Any trade embargo against Patria would be ‍likely to fail at some time.
(E) For a blockade of Patria's ports to be success‍ful, international opinion must be unanimous.
E为什么错？不是和“a high degree of both international accord and ability to prevent goods from entering or leaving that country must be sustained”一致吗？

因为封锁导致国际分歧, 所以国际不分歧一定意味着不封锁; 而只有封锁才能成功实现禁运, 所以国际不分歧即意味着禁运不成功. 所以E是个逻辑混乱的选项.