Sentence Correction

Possible long-term consequences of the "greenhouse effect,?the gradual warming of the Earth's climate, may include melting the polar ice caps and a rising sea level.

A.may include melting the polar ice caps and a rising sea level

B.may include the melting of polar ice caps and the rising sea level

C.may include polar ice caps that are melting and sea levels that are rising

D.include melting the polar ice caps and sea levels that are rising

E.include melting of the polar ice caps and a rise in sea level

IMO the answer is E

The word "possible" at the beginning of the sentence makes "may" redundant. Eliminate solutions a,b,and c.

Between D and E, the answer has to be in passive voice to emphasize the consequences. Solution D can be interpreted that the "consequences" cause melting, when logically the melting of the ice caps and rise in sea level need to be that examples of "consequences."

IMO A

Only A and C are parallel.
C: "may include polar ice caps that are melting and sea levels that are rising "

long-term consequences include melting of .. and rising of .. and not polar ice caps and sea level themselves.

What is OA?

OA is E
I took C as answer for parallel construction. thanks paual for pointing out "possible" makes May reduntant. if thats taken into account than automatically E is best choice.

your welcome!