如果B选项:From what has happened in the past, it is impossible to infer with certainty what will happen in the future, so an accident could still trigger a third world war between superpowers.
去掉最后一句so an accident could still trigger a third world war between superpowers.
我认为主要是文章结论“policy has worked”的理解,什么就算work了呢,文章最后一句说proof is 3rd world war is not happening,也就是世界大战没发生就算work。 (D)说大国进行了很多次小规模交锋,和题干并不冲突,说明policy还是work的,因为世界大战没有发生。 另外如果考试的时候有时间限制还是应该选(E)而不是(D),因为D太specific了,而E只是说可能有其他原因(后面的such as 只是举例)。