请教nn们一道SC,多谢

On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.

A.      On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow

B.       On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth

C.      On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles

D.      Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate

E.       Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow

答案是E

想问下C为啥错了。。。

C 中 可能有歧义，as seen 有修饰sunspot cycles的可能，

这题用倒装的好处在于 rate 既做了主句的主语，也做了从句的的修饰成分

有道理，多谢啦