B is ungrammatical ("agree that is caused...").

The "in burning fossil fuels" in A and in the original is unidiomatic.

D and E are more convoluted than necessary, though grammatical.

C is the the most natural choice for me.

This also would be good:  a phenomenon that most scientists agree is caused by human beings burning fossil fuels,

On Mon, Feb 26, 2018 at 3:56 PM, Jessica Thomasson <[log in to unmask]> wrote:

Answer C sounds most natural to me.

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On Mon, Feb 26, 2018 at 3:53 PM, John Crow <[log in to unmask]> wrote:

A former student of mine is studying for the GMAT and is struggling with the sentence structure section.  She sent me a sample from the practice test.  Not only did I miss it, but I disagree with the answer that was given.  What is your take?

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,

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