求问一道语法题

ylms1119

Unlike mainstream American businesses, more than half of which fail, the failure rate for businesses in the Amish community hovers around 5 percent.
A. Unlike mainstream American businesses, more than half of which fail
B. Unlike mainstream American businesses, in which the failure rate is more than half
C. Unlike mainstream American businesses, where more than half of them fail
D. While the rate of mainstream American businesses failing is more than half
E. While more than half of mainstream American businesses fail
  Answer: E
为什么不选D？

hwwinwin

翻一下，D的语义变了

ylms1119

好TRICKY喔~~谢谢！