请教一道PREP里面关于Significant and Significantly的题

26. (25911-!-item-!-188;#058&002160)

The investigations of many psychologists and anthropologists support the generalization of

there being little that is a significant difference in the underlying mental processes manifested by

people from different cultures.

(A) of there being little that is a significant difference

(B) of there being little that is significantly different

(C) of little that is significantly different

(D) that there is little that is significantly different

(E) that there is little of significant differences 

答案选D 但是我之前看新东方的网络课堂上面说Significant 和 Significantly的意思不一样

如果题干里用的是哪个词正确答案就应该用哪个词来防止改变原文意思

而这道题最后选的是Significantly而不是题干里的Significant

哪位高手来给我解一下惑啊

A我知道一定错

但是E语法哪里错呢？