请教一道GWD语法题

A new study suggests that the conversational pace of everyday life may be so brisk it hampers the ability of some children for distinguishing discrete sounds and words and, the result is, to make sense of speech.

1. it hampers the ability of some children for distinguishing discrete sounds and words and, the result is, to make
2. that it hampers the ability of some children to distinguish discrete sounds and words and, as a result, to make
3. that it hampers the ability of some children to distinguish discrete sounds and words and, the result of this, they are unable to make
4. that it hampers the ability of some children to distinguish discrete sounds and words, and results in not making
5. as to hamper the ability of some children for distinguishing discrete sounds and words, resulting in being unable to make

正确答案是B，我选择了D，是不是D选项如果后边改成 and that results in not making 就对了呢？

请高人赐教！谢谢

如果改为and that results in not making的话这里面的that跟原句的前面两个that都无法平行，所以还是错的.