Not all employment selection mechanisms that have a “disparate effect,” that is, that screens out a percentage of minorities or women disproportionate to their presence in the relevant labor market, are unlawful. (A) that is, that screens out a percentage of minorities or women disproportionate to (B) which means, that screens out a percentage of minorities or women disproportionate with (C) which means, that screen out a percentage of minorities or women disproportionate with (D) that is, that screen out a percentage of minorities or women disproportionate to (E) that is, that screens out a percentage of minorities or women disproportionate with

"that is "这里是什么作用？是插入语吗？不相当于“what means”? 后面的“that”是引导定语从句的吗？“disproportionate to their presence in the relevant labor market,”有时修饰什么的呢？

糊涂啊！！！

that is 是一个插入语，相当于口语中的：也就是说；换句话说；

后面的that从句是定从修饰disparate effect；

disproportionate引导形容词短语(相当于定从的省略形式)修饰percentage结构。

 哦，也就是说，主干是：Not all employment selection mechanisms ...are

unlawful...对吧？？，谢谢啦！！