Those skeptical of the extent of global warming argue that

IMO,
"divded on"/"dived over" both are correct idioms.


I chose E because..
whether significant warming will occur and what impact would have -->
conveys the following meaning..
whether siginicant warming will occur or not.? "if occured.. what impact it would have?"

Also in A..
"what impact will it have if it does" --> sounds little akward.

"what impact it will have if it does" --> sound better.

What is OA?
What is Source?
What is OE if available

I think the conditional statement in option A has the correct structure as below.

"if + present tense + then (optional) + future tense".

past "would" in option E is not required.

Awaiting OA and OE.

thats why I had tough time choosing between A and E.

if it has "what impact it will have if it does" --> then definitely I would have gone for A.

If I fly to New York, I will visit Empire State building. --> correct
If I fly to New York, will I visit Empire State building. --> is this sounds good?
are you asking question..

That's the only reason I rejected A..

I would say E

Idiom, it is 'divided over' not 'divided on'

Thanks for the clarification. I think, this clearly makes E a correct option.

Agree with E

Agrees with subjunctive, if significant warming will occur then what impact it would have

depends on/over can be used as idiom.

A - has redundancy issue.
(whether significant warming will occur and if it does.)

I don't agree with that:
both are correct idioms.

DIVIDED ON: (Below sentences are from NY TIMES)
-----------
In the United States, media specialists are divided on whether the government could or should help the efforts.

Arab leaders remain cripplingly divided on how to respond to the crisis

I made this decision because Jeff and I were really divided on the future of this program and what we wanted from the program

DIVIDED OVER:(Below sentences are from NY TIMES)
-------------
“Republicans are divided over how aggressively to take on Obama.

Opinions will surely be divided over the exotically ornate costumes designed expressly for Ms. Fleming by Christian Lacroix



Below is from Merriam-Webster Dictionary
divided
Function:
adjective
Meaning:
1 [more divided; most divided] : separated by different opinions : in a state of disagreement ▪ Experts are sharply divided on/over the issue. ▪ The issue has created a deeply divided nation.
2 : given to two or more people or things rather than to just one person or thing ▪ She feels like she only gets her mother's divided attention. ▪ He has divided loyalties. [=he is trying to be loyal to opposing groups, ideals, etc.]

A is also a bit wordy and that's why I chose E.

The answer should be E). A) shouldn't be right:

"on whether significant warming will occur and what impact will it have if it does."

The end of the sentence is phrased as a question, with the verb ('will') before the subject ('it'). For A) to have any chance of being correct, it would need to read "and what impact it will have if it does". A) has other problems as well, but this one is the clincher for me.

I do not have the OA on this one. Only had the question!

Are you freaking kidding me? How does this help ANYONE?

Google is helpful if you need an OA - just searched, and the OA is E. The question is from GMATPrep.

Now now, found a good explanation here:
https://www.manhattangmat.com/forums/th ... t1938.html

The OA is E.