16. 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.无关
(B) As long as international opinion is unanimously against Patria, a trade embargo is likely to succeed. Internation accordàtrade embargo ,逆命题，错
(C) A naval blockade of Patria’s ports would ensure that no goods enter or leave Patria. Trade embardoà the ability to prevent good from entering
(D) Any trade embargo against Patria would be likely to fail at some time.（D）
(E) For a blockade of Patria’s ports to be successful, international opinion must be unanimous. Trade embargo à international accord
答案是D 我想通过这道归纳题理解一下充分必要性我认识的对不对
全文的逻辑关系如下
Trade embargoà1.international accord+ 2. the ability to prevent goods from entering.
逆否：international discord or the disability to prevent good from entering -à no trade embargo
International discord to Patria.-à no trade embargo
请问
1 我写的C和E的充分必要关系对不对 如果是对的
感觉也应该是答案
因为A--->B1+B2, 那么选项中A--B1 或A---B2应该也是对的
2 A ensure B A是B的什么条件呢 如何判断呢
谢谢
原文逻辑：1。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。2。an embargo——〉A total blockade of Patria’s ports。
原文给的推理起点： such an action（指A total blockade of Patria’s ports ） would be likely to cause international discord over the embargo.所以根据逻辑1，EMBARGO不成功。即D
A ensure B。A和B没有推理关系
lawyer 谢谢你的答复
A ensure B
能否理解为A-->B
谢谢
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