og 118,求帮忙辨明结构

shiningsmile

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,
首先请教问什么以粘贴上去下划线就没了呢？
入正题：知道答案选C，请大侠帮忙分析一下正确答案，也就是这个同谓语的结构，那个most scinentists agree 是不是当成插入语不看的呢，否则我都分不清主谓等结构了！谢谢！

movcn

把most scientists agree 改成 I think，就能明白了吧