1. 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（D）
(E) that is, that screens out a percentage of minorities or women disproportionate with
句子里面的that is 的作用是不是让后面的that从句修饰前面的mechanisms？帮忙解释一下这里that is 的用法吧，以前没有见过。谢谢了！ | 
