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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.
(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
The rate which trees grow is believed to be among the surest indications on Earth of sunspot cycles, as seen in the rings visible in the cross sections of their trunks.
体会一下BY的例子：
Out of sth. grows a market for ...
Among the surest indications on Earth of sunspot cycles 是介词短语，其后用全倒装。
在全倒装结构中,谓语动词的数的形式由谓语动词后的主语的形式决定。
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