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Gas hydrates, chemical compounds of water and natural gas, are increasingly being
studied for their potential to be huge reservoirs of energy, possibly causing sea floor instability, and significant contributors to global warming.
A. to be huge reservoirs of energy, possibly causing sea floor instability, and
B. to be huge reservoirs of energy, possibly causing sea floor instability, and even as
C. as huge reservoirs of energy, possibly causing sea floor instability, and
D. as huge reservoirs of energy, and the possible cause of sea floor instability,
E. as huge reservoirs of energy, as possible causes of sea floor instability, and even
as
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D is incorrect because the ", and" spoils the parallelism and the phrase "significant contributors to global warming" cannot act as an absolute phrase in this structure.
Gas hydrates, chemical compounds of water and natural gas, are increasingly being studied for their potential as huge reservoirs of energy, possibly causing sea floor instability, and significant contributors to global warming.
Besides the lack of parallelism, the meaning is distorted.
The sentence with C in it indicates incorrectly that, 'sea floor instability' is caused by the studies
The phrase 'significant contributors' is incorrect.
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.