Dinesh654
well, surprising thing is pronouns they, them are not referring to anything in the sentence. Is this ok? experts?
Certainly not something we see every day on the GMAT! But since we have the same "issue" in all five choice, we don't have to worry about it.
Remember, we're not here to look at a single sentence in a bubble and label it right or wrong based on our so-called grammar rules. These "rules" are really about clarity: pronouns with clear and logical references are generally better than pronouns that lack a clear and logical reference. Why? Because obviously the meaning is clearer in the first case.
In a piece of writing, you'll certainly see sentences that have a pronoun without an antecedent. In this particular question, the GMAT is just implying some unknown subject that presumably would have been mentioned earlier, if this sentence had been part of a larger passage.
But again, the most important takeaway is this: if you see the same "issue" in all five choices, then you KNOW that you can't use that "issue" as a decision point. End of story.
I hope that helps!