两道SC的JJ

T-4-Q22
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

是D吗？

谢谢LS，能解释一下吗？这是while引导的并列吗，如果是为什么主语不一致呢？

还一道：1.GWD 29-2
The discovery that Earth’s inner core rotates independently of and more quickly than Earth’s outer layers is responsible for advancing studies of the flow of heat from the inner through the outer planet and of the formation and periodic reversal in direction of Earth’s magnetic field.

A,core rotates independently of and more quickly than Earth’s outer layers is responsible for advancing studies of the flow of heat from the inner through the outer planet and of the formation and periodic reversal in direction of Earth’s magnetic field
B,core rotates independently of and more quickly than Earth’s outer layers is responsible for advancing studies of how heat from the inner core flows through the outer planet, and the formation and periodic reversal in direction of Earth’s magnetic field
C,core rotates independently and more quickly than Earth’s outer layers are responsible for advancing studies of how heat from the inner core flows through the outer planet, and how Earth’s magnetic field forms and the periodic reversal of its direction
D,core, rotating independently and more quickly than Earth’s outer layers, are responsible for advancing studies of the flow of heat from the inner through the outer planet, and the formation and periodic reversal in direction of Earth’s magnetic field
E,core, rotating independently of and more quickly than Earth’s outer layers, is responsible for advancing studies of the flow of heat from the inner through the outer planet and of how Earth’s magnetic field forms and the periodic reversal of its direction

答案是A，不明白为什么不是B，表示目的的并列不是应该有逗号吗，请NN讲解。

這題是考比較要同類的陷阱題，千萬要注意......a.b.c.d.就不贅述因為語意都不通.....While引導的Adv cl 語意表對照時..不需要主詞同類，當然更不用相同.....這題要用句意做最簡單..其他選項都講不通