Discussion of Greenhouse Effects Have Usually Had as a Focus the Possibility of Earth Growing Warmer

Question: Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might, but climatologists have indicated all along that precipitation, storminess, and temperature extremes are likely to have the greatest impact on people.

1. Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might,
2. Discussion of greenhouse effects has usually had as its focus whether Earth would get warmer and what the extent would be,
3. Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and to what extent,
4. The discussion of greenhouse effects have usually focused on the possibility of Earth getting warmer and to what extent it might,
5. The discussion of greenhouse effects has usually focused on whether Earth would grow warmer and the extent that is,

“Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might, but climatologists have indicated all along that precipitation, storminess, and temperature extremes are likely to have the greatest impact on people.” - is a GMAT sentence correction question. This particular GMAT sentence correction topic has been taken from the book ‘The Official Guide of GMAT Verbal Review, 2nd Edition, 2009’. This question checks Parallelism, Comparison of two elements, and Modifiers. GMAT Sentence Correction comprises 11-16 questions to be completed within 65 minutes. Each Sentence Correction question contains a sentence with an underlined portion that includes 0-2 errors.

Answer: C
Explanation: The statement given is - Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might, but climatologists have indicated all along that precipitation, storminess, and temperature extremes are likely to have the greatest impact on people.
In the above statement
Subject is Discussion which is Singular
Therefore we need a Singular verb
Lets evaluate our option statements

Option A: Incorrect 
In this statement we have -’ have’ not singular. so the statement is incorrect.

Option B: Incorrect 
In this statement, we don't know the ‘Extent of what ?’ so the statement is incorrect

Option C: Correct 
This statement is correct.

Option D: Incorrect 
In this statement we have -’ have’ not singular. so the statement is incorrect.

Option E: Incorrect 
In this statement, the uses of the simple present tense denote a future action, which is incorrect.

The correct answer is C

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