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Beer lovers should be grateful to researchers at the University of Western Ontario, who in 2004 published a paper whose main finding was that beer possess the same antioxidant benefits as red wine does.
This answer choice corrects the original grammatical mistake. The singular subject beer does not agree with the plural verb possess. This is corrected by replacing possess with the singular verb possesses.
This answer choice is grammatically incorrect. The singular subject beer does not agree with the plural verb possess.
This answer choice repeats the original mistake. The singular subject beer does not agree with the plural verb possess.
In addition, this answer choice creates another Subject Verb Agreement mistake: the singular subject finding does not agree with the plural verb were.
While this answer choice corrects the original Subject Verb Agreement mistake, it creates a new one. The singular subject finding does not agree with the plural verb were.
Did you notice the change from was to were?
The lesson to be learned here is to pay closer attention to details.
Do not assume that the only thing that changes in the answer choices is the part which was flawed in the original sentence. Different answer choices can make all kinds of changes in various parts of the sentence.
Did you go over all five answer choices (except for A which you don't need to read as it repeats the original sentence without any changes)?
Good! That's what you should have done!
The lesson to be learned here is not to automatically choose the first answer choice that corrects the original mistake.
Remember that in Sentence Correction questions, we do not choose a correct answer but rather eliminate four incorrect answer choices and choose the last one standing.
After eliminating answer choices that repeat the original mistake, you have to go over all the remaining answer choices carefully and compare them word for word. This is the only way you'll be able to correctly eliminate all but one of them.
While this answer choice corrects the original Subject Verb Agreement mistake and is grammatically correct, it changes the meaning of the original sentence by omitting the word main.
Good that you noticed, but this change is also significant and affects the correctness of the answer choice! Next time, when you notice a change, see whether this change is innocent or whether it introduces an error.