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Sentence Correction: Pronoun Questions - Ambiguity

Researchers do not yet know how the direction in which people gaze when they are trying to answer difficult questions - rightward or leftward - is determined by the brain.

Well done!

This answer choice is grammatically correct and stylistically superior to the original sentence because it is both clearer and more concise - the pronoun they in the original sentence is unnecessary and creates ambiguity.

Incorrect.

While this answer choice is grammatically correct, it is stylistically flawed.The pronoun they is ambiguous because it can refer to either Researchers or people. There is another grammatically correct answer choice which is stylistically better than this one. 

Did you read the other answer choices?

Good! That's what you should have done. It's a shame you didn't see that one of them was stylistically better than this answer choice. 

This is a mistake. In Sentence Correction, we do not choose a correct answer choice but rather eliminate four incorrect ones and choose the last one standing.

This means that you need to go over all answer choices and find a reason to eliminate four of them. Only then can you choose the remaining answer choice.

GMAT mistakes are not only grammatical mistakes, which are mistakes that can be identified when reading the original sentence. There are also stylistic mistakes such as redundancy, which often can only be identified when you see an answer choice which is more concise than the original sentence (major hint).

That's why if you don't find a mistake in the original sentence, you cannot be sure whether it's because there really is no mistake or because there is a mistake, but it is subtle and you missed it. In order to determine which if the two scenarios is correct, you need to go over all other four answer choices and compare them to answer choice (A).

Incorrect.

This answer choice is grammatically incorrect. The singular subject direction does not agree with the plural verb are.

[[snippet]]

This answer choice is grammatically incorrect. The singular subject direction does not agree with the plural verb are.

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect. The singular subject direction does not agree with the plural verb are.

[[snippet]]
when they are trying to answer difficult questions - rightward or leftward - is
when they are trying to answer difficult questions - rightward or leftward - are
while trying to answer difficult questions - rightward or leftward - are
while trying to answer difficult questions - rightward or leftward - is
when they are trying to answer a difficult question - rightward or leftward - are
Yes, I went over all of them
I went over some of the answer choices
No, I didn't. I didn't find a mistake in the original sentence, so I didn't think I needed to.