这一个单选题，为何不可以选B？
网友非常想找到支持自己看法的证据，觉得which 指整个主句的内容，forwhich 表示从句发生的“缘由”。我给网友提供一些例句。注意察看：
He has a widerange of knowledge, for which he is admired.
他有广博的常识，因而得到大伙的钦佩。
Charles cheated inthe exam, for which he was severely punished.
查尔斯在考试中作弊，为此他遭到了严厉的惩罚。
The young woman workerinvented a new power-saving machine, for which she was awarded the title oflabor heroine.
这位年轻人女工创造了一种新的节能机器，从而荣获“劳动英雄”的光荣称号。
The old mandevoted all he had to helping the poor, for which he was praised.
这位老人把他的所有些所有都致力于帮助没钱人，由于这件事他被高度的表彰。
The Partysecretary held a grand wedding for his son, for which he was criticizedpublicly.
那个书记为儿子举行了盛大的结婚典礼，遭到了公开的批评。
He had anexcellent academic performance at school, for which he was sent abroad forfurther education when he graduated.
他在学校成绩突出，为此在毕业时被选送出国深造。
不知网友发现没？1. 这类例句中，定语从句的谓语动词一般表示“表彰、羡慕、受奖、批评、责备、惩罚”等含义；2. 主句只不过给从句提供一种理由，而不是根本缘由。最后一句，虽不是表彰与批评，但主句只不过给从句提供一种理由，没有因果关系。
网友的句子，“飞行员失联与飞机失事”存在势必的因果关系。而as a result of which，表示失联的结果。
