求大家解答一个语法疑问

哑舍

The Nobel Prize in chemistry was awarded to three scientists for their discovery that plastic can be made electrically conductive—an advance that has led to improvements in film, television screens, and windows.

A. that plastic can be made electrically conductive—an advance that has led
B. that plastic can be made electrically conductive—this advance leading
C. that plastic can be made to be electrically conductive, and this advance led
D. of plastic's ability to be made electrically conductive, with this advance leading
E. of plastic being able to be made electrically conductive—an advance that has led
这道题做的时候选对了选了A，但是对B的分析不太清楚，破折号加this advance leading的这个用法错误是在哪呢？求解答或者有看到关于选项B比较好的解释的，如ron的求链接，自己木有搜到啊

Bradz

What is wrong with ----- this advance leading to?

Ron: you can't start with 'this advance' unless you're writing a new independent clause (as you would if you were following a coordinating conjunction such as 'and', 'but', etc.) if you're going to use a modifier like this, it should start with 'AN advance' (as does choice A).

哑舍

Bradz 发表于 2016-10-21 13:32
What is wrong with ----- this advance leading to?

Ron: you can't start with 'this advance' unless y ...

太感谢 啦！！