[求助][讨论]OG12-118（未找到讨论帖）

 118.    The World Wildlife Fund has declared that global
                            warming, a phenomenon most scientists agree to
be
                                caused by human beings in burning fossil fuels, will
                            create   havoc among migratory birds by altering the
                            environment in ways harmful to their habitats.

(A)       
a phenomenon
most scientists agree to be
                        caused by human beings in burning fossil fuels,

(B)       
a
phenomenon most scientists agree that is
            caused by fossil fuels burned by human beings,

(C)       
a
phenomenon that most scientists agree is
            caused by human beings' burning of fossil fuels,

(D)       
which
most scientists agree on as a phenomenon
            caused by human beings who burn fossil fuels,

(E)       
which
most scientists agree to be a
            phenomenon caused by fossil fuels burned by
            human beings,

正确选项是C。

我的疑惑是为什麽不能选A。OG给的解释太不清楚了：A—— To be caused and in burning are wordy, awkward, and indirect.

为什麽它就 wordy, awkward, and indirect呢？

A还原以后应该是这样吧？——most scientists agree global warming to be caused by human beings in burning fossil fuels,

请教大家！

open to discuss~