Integrated circuits and the silicon chip increased the computer to the point____e-mail became realis

题目

Integrated circuits and the silicon chip increased the computer to the point____e-mail became realistic and possible.
A.that B.where C.when D.why
最好大家能把这句话翻译一下，我看不懂

答案

B
point 是一个点,用where作关系副词.
补充：翻译：
集成电路和硅集成块已经是电脑上升到可以使电子邮件变得可能和现实的高度.